224 lines
12 KiB
JSON
224 lines
12 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-2024-53143",
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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": "2024-11-19T17:17:24.997Z",
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"datePublished": "2024-12-07T06:40:43.522Z",
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"dateUpdated": "2026-08-05T11:44:05.871Z"
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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": "2026-08-05T11:44:05.871Z"
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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\nfsnotify: Fix ordering of iput() and watched_objects decrement\n\nEnsure the superblock is kept alive until we're done with iput().\nHolding a reference to an inode is not allowed unless we ensure the\nsuperblock stays alive, which fsnotify does by keeping the\nwatched_objects count elevated, so iput() must happen before the\nwatched_objects decrement.\nThis can lead to a UAF of something like sb->s_fs_info in tmpfs, but the\nUAF is hard to hit because race orderings that oops are more likely, thanks\nto the CHECK_DATA_CORRUPTION() block in generic_shutdown_super().\n\nAlso, ensure that fsnotify_put_sb_watched_objects() doesn't call\nfsnotify_sb_watched_objects() on a superblock that may have already been\nfreed, which would cause a UAF read of sb->s_fsnotify_info."
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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:L/UI:N/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 purely through local syscalls — inotify_init/inotify_add_watch/inotify_rm_watch on one side and mount/umount on the other. No network or remote peer input is involved.\nAC:L - The attacker owns both sides of the race: their own thread dropping the inotify mark and their own thread unmounting their own tmpfs in a private mount namespace, and the loop can be retried indefinitely with attacker-chosen heap grooming and CPU pinning to widen the window.\nPR:L - inotify_user.c has no capability checks at all, and tmpfs/ramfs/FUSE are FS_USERNS_MOUNT, so an unprivileged user gets the required mount and umount via unshare -Urm — per guidance, user-namespace-reachable is Low, not High.\nUI:N - A single unprivileged process drives the entire sequence — create the mount, add and remove the watch, and unmount — with no action by any other user.\nS:U - The corruption is of kernel slab objects (super_block, shmem_sb_info) within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed super_block and s_fs_info are read after free (SHMEM_SB(inode->i_sb) dereference, sb->s_fsnotify_info read), and since the attacker can reallocate those kmalloc slots with controlled data and observe the results, this is leverageable for kernel memory disclosure.\nI:H - The post-free path performs writes into freed memory — sbinfo->free_ispace accumulation, spin_lock acquisition, and list_del on the freed sb->s_inodes head — giving a groomable write primitive into attacker-reallocated slab objects suitable for control-flow hijacking.\nA:H - The most likely outcome is the CHECK_DATA_CORRUPTION(\"VFS: Busy inodes after unmount\") report, which is a BUG() with CONFIG_BUG_ON_DATA_CORRUPTION, and otherwise the use-after-free on a freed superblock reliably oopses the kernel."
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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/notify/mark.c"
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],
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"versions": [
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{
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"version": "d2f277e26f521ccf6fb438463b41dba6123caabe",
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"lessThan": "45a8f8232a495221ed058191629f5c628f21601a",
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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": "d2f277e26f521ccf6fb438463b41dba6123caabe",
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"lessThan": "83af1cfa10d9aafdabd06b3655e07727f373b434",
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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": "d2f277e26f521ccf6fb438463b41dba6123caabe",
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"lessThan": "21d1b618b6b9da46c5116c640ac4b1cc8d40d63a",
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"status": "affected",
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"versionType": "git"
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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/notify/mark.c"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.11.11",
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"lessThanOrEqual": "6.11.*",
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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": "6.12.2",
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"lessThanOrEqual": "6.12.*",
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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": "6.13",
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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": "6.10",
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"versionEndExcluding": "6.11.11"
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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": "6.10",
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"versionEndExcluding": "6.12.2"
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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": "6.10",
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"versionEndExcluding": "6.13"
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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/45a8f8232a495221ed058191629f5c628f21601a"
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},
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{
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"url": "https://git.kernel.org/stable/c/83af1cfa10d9aafdabd06b3655e07727f373b434"
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},
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{
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"url": "https://git.kernel.org/stable/c/21d1b618b6b9da46c5116c640ac4b1cc8d40d63a"
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},
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{
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"url": "https://project-zero.issues.chromium.org/issues/379667898"
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}
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],
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"title": "fsnotify: Fix ordering of iput() and watched_objects decrement",
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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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"problemTypes": [
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{
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"descriptions": [
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{
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"type": "CWE",
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"cweId": "CWE-416",
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"lang": "en",
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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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"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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"timestamp": "2024-12-11T14:22:39.197739Z",
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"id": "CVE-2024-53143",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2024-12-13T13:57:38.651Z"
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}
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}
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]
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}
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} |