347 lines
20 KiB
JSON
347 lines
20 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-49349",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-02-26T02:08:31.544Z",
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"datePublished": "2025-02-26T02:11:02.993Z",
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"dateUpdated": "2026-08-05T08:54:51.229Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:54:51.229Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_rename_dir_prepare\n\nWe got issue as follows:\nEXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue\next4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478\next4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000\next4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae\n==================================================================\nBUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220\nRead of size 4 at addr ffff88810beee6ae by task rep/1895\n\nCPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241\nCall Trace:\n dump_stack+0xbe/0xf9\n print_address_description.constprop.0+0x1e/0x220\n kasan_report.cold+0x37/0x7f\n ext4_rename_dir_prepare+0x152/0x220\n ext4_rename+0xf44/0x1ad0\n ext4_rename2+0x11c/0x170\n vfs_rename+0xa84/0x1440\n do_renameat2+0x683/0x8f0\n __x64_sys_renameat+0x53/0x60\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\nRIP: 0033:0x7f45a6fc41c9\nRSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9\nRDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005\nRBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080\nR10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0\nR13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000\n\nThe buggy address belongs to the page:\npage:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee\nflags: 0x200000000000000()\nraw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000\nraw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n>ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ^\n ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\nDisabling lock debugging due to kernel taint\next4_rename_dir_prepare: [2] parent_de->inode=3537895424\next4_rename_dir_prepare: [3] dir=0xffff888124170140\next4_rename_dir_prepare: [4] ino=2\next4_rename_dir_prepare: ent->dir->i_ino=2 parent=-757071872\n\nReason is first directory entry which 'rec_len' is 34478, then will get illegal\nparent entry. Now, we do not check directory entry after read directory block\nin 'ext4_get_first_dir_block'.\nTo solve this issue, check directory entry in 'ext4_get_first_dir_block'.\n\n[ Trigger an ext4_error() instead of just warning if the directory is\n missing a '.' or '..' entry. Also make sure we return an error code\n if the file system is corrupted. -TYT ]"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only via the local VFS rename path (renameat → vfs_rename → ext4_rename → ext4_rename_dir_prepare → ext4_get_first_dir_block) after mounting a crafted ext4 image; there is no network-protocol or packet-processing entry into this path.\nAC:L - A crafted first directory entry with an oversized rec_len (e.g. 34478) deterministically makes ext4_next_entry compute a parent_de past the buffer_head into freed memory; the attacker fully controls on-disk dirents with no race or attacker-uncontrollable layout required.\nPR:N - The attacker needs no privileges on the target—only a malicious ext4 image (USB/SD/loop); ext4 lacks FS_USERNS_MOUNT, so CAP_SYS_ADMIN belongs to the victim or automount path that mounts the volume.\nUI:R - Exploitation requires a user or automount/storage daemon to mount the attacker-supplied ext4 volume and then rename a crafted directory so the corrupt '.' / '..' walk runs in ext4_rename_dir_prepare.\nS:U - Impact is host-kernel heap/page UAF within the same OS security authority; this is standard local privilege escalation, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - KASAN demonstrates a use-after-free read of parent_de->inode from a freed page; UAF reclaim/heap spray yields arbitrary kernel read primitives, scored Confidentiality High per UAF guidance.\nI:H - If sprayed freed-page contents satisfy the parent inode check, ext4_rename_dir_finish writes through the dangling parent_de pointer (parent_de->inode = dir_ino), yielding a UAF write / control-flow hijack primitive scored Integrity High.\nA:H - The demonstrated KASAN use-after-free in ext4_rename_dir_prepare and subsequent dangling-pointer use can oops/panic the kernel even without full exploitation, so Availability impact is High."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ext4/namei.c"
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],
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"versions": [
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{
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "1a3a15bf6f9963d755270cbdb282863b84839195",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "97f802a652a749422dede32071d29a53cf4bd034",
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"status": "affected",
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},
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{
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "10801095224de0d0ab06ae60698680c1f883a3ae",
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"status": "affected",
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "eaecf7ebfd5dd09038a80b14be46b844f54cfc5c",
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"lessThan": "dd887f83ea54aea5b780a84527e23ab95f777fed",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "364380c00912bed9b5d99eb485018360b0ecf64f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "0ff38b99fa075ddd246487a28cb9af049f4ceef1",
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"status": "affected",
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},
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{
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"lessThan": "4a2bea60cf7ff957b3eda0b17750d483876a02fa",
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"status": "affected",
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},
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{
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"version": "32f7f22c0b52e8189fef83986b16dc7abe95f2c4",
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"lessThan": "0be698ecbe4471fcad80e81ec6a05001421041b3",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ext4/namei.c"
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],
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"versions": [
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{
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"version": "3.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.9.318",
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"lessThanOrEqual": "4.9.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.14.283",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.19.247",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.198",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.121",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.46",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.17.14",
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"lessThanOrEqual": "5.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.18.3",
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"lessThanOrEqual": "5.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.19",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "4.9.318"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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},
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{
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"versionEndExcluding": "5.15.46"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "5.17.14"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/1a3a15bf6f9963d755270cbdb282863b84839195"
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},
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{
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"url": "https://git.kernel.org/stable/c/97f802a652a749422dede32071d29a53cf4bd034"
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},
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{
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"url": "https://git.kernel.org/stable/c/10801095224de0d0ab06ae60698680c1f883a3ae"
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},
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{
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"url": "https://git.kernel.org/stable/c/eaecf7ebfd5dd09038a80b14be46b844f54cfc5c"
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},
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{
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"url": "https://git.kernel.org/stable/c/dd887f83ea54aea5b780a84527e23ab95f777fed"
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},
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{
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"url": "https://git.kernel.org/stable/c/364380c00912bed9b5d99eb485018360b0ecf64f"
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},
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{
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"url": "https://git.kernel.org/stable/c/0ff38b99fa075ddd246487a28cb9af049f4ceef1"
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},
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{
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"url": "https://git.kernel.org/stable/c/4a2bea60cf7ff957b3eda0b17750d483876a02fa"
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},
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{
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"url": "https://git.kernel.org/stable/c/0be698ecbe4471fcad80e81ec6a05001421041b3"
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}
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],
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"title": "ext4: fix use-after-free in ext4_rename_dir_prepare",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2022-49349",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-02-27T18:16:42.619044Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
|
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2025-02-27T18:22:33.920Z"
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}
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}
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]
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}
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} |