263 lines
14 KiB
JSON
263 lines
14 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-2022-49738",
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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": "2025-03-27T16:39:17.986Z",
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"datePublished": "2025-03-27T16:42:50.951Z",
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"dateUpdated": "2026-08-15T12:22:55.595Z"
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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": "2026-08-15T12:22:55.595Z"
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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\nf2fs: fix to do sanity check on i_extra_isize in is_alive()\n\nsyzbot found a f2fs bug:\n\nBUG: KASAN: slab-out-of-bounds in data_blkaddr fs/f2fs/f2fs.h:2891 [inline]\nBUG: KASAN: slab-out-of-bounds in is_alive fs/f2fs/gc.c:1117 [inline]\nBUG: KASAN: slab-out-of-bounds in gc_data_segment fs/f2fs/gc.c:1520 [inline]\nBUG: KASAN: slab-out-of-bounds in do_garbage_collect+0x386a/0x3df0 fs/f2fs/gc.c:1734\nRead of size 4 at addr ffff888076557568 by task kworker/u4:3/52\n\nCPU: 1 PID: 52 Comm: kworker/u4:3 Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nWorkqueue: writeback wb_workfn (flush-7:0)\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:284 [inline]\nprint_report+0x15e/0x45d mm/kasan/report.c:395\nkasan_report+0xbb/0x1f0 mm/kasan/report.c:495\ndata_blkaddr fs/f2fs/f2fs.h:2891 [inline]\nis_alive fs/f2fs/gc.c:1117 [inline]\ngc_data_segment fs/f2fs/gc.c:1520 [inline]\ndo_garbage_collect+0x386a/0x3df0 fs/f2fs/gc.c:1734\nf2fs_gc+0x88c/0x20a0 fs/f2fs/gc.c:1831\nf2fs_balance_fs+0x544/0x6b0 fs/f2fs/segment.c:410\nf2fs_write_inode+0x57e/0xe20 fs/f2fs/inode.c:753\nwrite_inode fs/fs-writeback.c:1440 [inline]\n__writeback_single_inode+0xcfc/0x1440 fs/fs-writeback.c:1652\nwriteback_sb_inodes+0x54d/0xf90 fs/fs-writeback.c:1870\nwb_writeback+0x2c5/0xd70 fs/fs-writeback.c:2044\nwb_do_writeback fs/fs-writeback.c:2187 [inline]\nwb_workfn+0x2dc/0x12f0 fs/fs-writeback.c:2227\nprocess_one_work+0x9bf/0x1710 kernel/workqueue.c:2289\nworker_thread+0x665/0x1080 kernel/workqueue.c:2436\nkthread+0x2e4/0x3a0 kernel/kthread.c:376\nret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n\nThe root cause is that we forgot to do sanity check on .i_extra_isize\nin below path, result in accessing invalid address later, fix it.\n- gc_data_segment\n - is_alive\n - data_blkaddr\n - offset_in_addr"
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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:N/A:H",
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"baseScore": 7.1,
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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 after a crafted f2fs image is mounted locally and GC runs is_alive→data_blkaddr; f2fs is not exposed via a network protocol handler.\nAC:L - The attacker fully controls on-disk i_extra_isize and summary ofs_in_node, so base+ofs indexes past the 4K node page deterministically once GC runs; free-space pressure or writeback can force GC with no race outside attacker control.\nPR:L - An unprivileged local user can get the image mounted via loop/removable-media automounters (udisks2, Android vold—f2fs is Android’s primary FS) and then trigger GC through ordinary writes; no capability check sits on the GC/writeback path.\nUI:N - The attacker supplies and mounts their own media (or triggers automount on insertion) and drives GC themselves via writeback/space pressure; no separate victim action is required.\nS:U - The OOB read and any resulting oops stay inside the host kernel’s security authority with no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - Crafted i_extra_isize makes data_blkaddr index addr_array[base+ofs] far past the node page (KASAN slab-OOB read of size 4), an unbounded out-of-bounds read of adjacent kernel memory.\nI:N - The OOB access is a read used only to compare source_blkaddr with the victim blkaddr; unlike the sibling recovery-path bug, this GC is_alive path performs no write through the bad index and yields no write primitive.\nA:H - The same out-of-bounds access faults in the writeback/GC kworker (as in the syzbot KASAN report), causing a kernel oops/panic and full denial of availability."
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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/f2fs/gc.c"
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],
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"status": "affected",
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{
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"fs/f2fs/gc.c"
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],
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{
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"version": "0",
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"lessThan": "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": "5.4.232",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.168",
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{
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"version": "5.15.93",
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"lessThanOrEqual": "5.15.*",
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},
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{
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"version": "6.1.11",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e5142a4935c1f15841d06047b8130078fc4d7b8f"
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},
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},
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"url": "https://git.kernel.org/stable/c/97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a"
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}
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],
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"title": "f2fs: fix to do sanity check on i_extra_isize in is_alive()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-125",
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"lang": "en",
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"description": "CWE-125 Out-of-bounds Read"
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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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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.1,
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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:N/A:H",
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"integrityImpact": "NONE",
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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": "2025-10-01T17:36:53.560613Z",
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"id": "CVE-2022-49738",
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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": "partial"
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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": "2025-10-01T17:36:56.110Z"
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}
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}
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]
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}
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} |