{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49738", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-03-27T16:39:17.986Z", "datePublished": "2025-03-27T16:42:50.951Z", "dateUpdated": "2026-08-15T12:22:55.595Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:22:55.595Z" }, "descriptions": [ { "lang": "en", "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\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" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/gc.c" ], "versions": [ { "version": "7a2af766af15887754f7f7a0869b4603b390876a", "lessThan": "e5142a4935c1f15841d06047b8130078fc4d7b8f", "status": "affected", "versionType": "git" }, { "version": "7a2af766af15887754f7f7a0869b4603b390876a", "lessThan": "914e38f02a490dafd980ff0f39cccedc074deb29", "status": "affected", "versionType": "git" }, { "version": "7a2af766af15887754f7f7a0869b4603b390876a", "lessThan": "97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a", "status": "affected", "versionType": "git" }, { "version": "7a2af766af15887754f7f7a0869b4603b390876a", "lessThan": "5b25035fb888cb2f78bf0b9c9f95b1dc54480d36", "status": "affected", "versionType": "git" }, { "version": "7a2af766af15887754f7f7a0869b4603b390876a", "lessThan": "d3b7b4afd6b2c344eabf9cc26b8bfa903c164c7c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/gc.c" ], "versions": [ { "version": "4.14", "status": "affected" }, { "version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.232", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.168", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.93", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.11", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.4.232" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.10.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.15.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.1.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e5142a4935c1f15841d06047b8130078fc4d7b8f" }, { "url": "https://git.kernel.org/stable/c/914e38f02a490dafd980ff0f39cccedc074deb29" }, { "url": "https://git.kernel.org/stable/c/97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a" }, { "url": "https://git.kernel.org/stable/c/5b25035fb888cb2f78bf0b9c9f95b1dc54480d36" }, { "url": "https://git.kernel.org/stable/c/d3b7b4afd6b2c344eabf9cc26b8bfa903c164c7c" } ], "title": "f2fs: fix to do sanity check on i_extra_isize in is_alive()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-125", "lang": "en", "description": "CWE-125 Out-of-bounds Read" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-10-01T17:36:53.560613Z", "id": "CVE-2022-49738", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T17:36:56.110Z" } } ] } }