{"api_version":"1","generated_at":"2026-09-15T21:31:18+00:00","cve":"CVE-2022-49738","urls":{"html":"https://cve.report/CVE-2022-49738","api":"https://cve.report/api/cve/CVE-2022-49738.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-49738","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-49738"},"summary":{"title":"f2fs: fix to do sanity check on i_extra_isize in is_alive()","description":"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","state":"PUBLISHED","assigner":"Linux","published_at":"2025-03-27 17:15:38","updated_at":"2026-08-15 13:17:26"},"problem_types":["CWE-125","CWE-125 CWE-125 Out-of-bounds Read"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"ADP","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","data":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/5b25035fb888cb2f78bf0b9c9f95b1dc54480d36","name":"https://git.kernel.org/stable/c/5b25035fb888cb2f78bf0b9c9f95b1dc54480d36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3b7b4afd6b2c344eabf9cc26b8bfa903c164c7c","name":"https://git.kernel.org/stable/c/d3b7b4afd6b2c344eabf9cc26b8bfa903c164c7c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e5142a4935c1f15841d06047b8130078fc4d7b8f","name":"https://git.kernel.org/stable/c/e5142a4935c1f15841d06047b8130078fc4d7b8f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a","name":"https://git.kernel.org/stable/c/97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/914e38f02a490dafd980ff0f39cccedc074deb29","name":"https://git.kernel.org/stable/c/914e38f02a490dafd980ff0f39cccedc074deb29","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-49738","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49738","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a2af766af15887754f7f7a0869b4603b390876a e5142a4935c1f15841d06047b8130078fc4d7b8f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a2af766af15887754f7f7a0869b4603b390876a 914e38f02a490dafd980ff0f39cccedc074deb29 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a2af766af15887754f7f7a0869b4603b390876a 97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7a2af766af15887754f7f7a0869b4603b390876a 5b25035fb888cb2f78bf0b9c9f95b1dc54480d36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2022","cve_id":"49738","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}},{"other":{"content":{"id":"CVE-2022-49738","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA 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Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/f2fs/gc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e5142a4935c1f15841d06047b8130078fc4d7b8f","status":"affected","version":"7a2af766af15887754f7f7a0869b4603b390876a","versionType":"git"},{"lessThan":"914e38f02a490dafd980ff0f39cccedc074deb29","status":"affected","version":"7a2af766af15887754f7f7a0869b4603b390876a","versionType":"git"},{"lessThan":"97ccfffcc061e54ce87e4a51a40e2e9cb0b7076a","status":"affected","version":"7a2af766af15887754f7f7a0869b4603b390876a","versionType":"git"},{"lessThan":"5b25035fb888cb2f78bf0b9c9f95b1dc54480d36","status":"affected","version":"7a2af766af15887754f7f7a0869b4603b390876a","versionType":"git"},{"lessThan":"d3b7b4afd6b2c344eabf9cc26b8bfa903c164c7c","status":"affected","version":"7a2af766af15887754f7f7a0869b4603b390876a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/f2fs/gc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.14"},{"lessThan":"4.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.232","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.168","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.93","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.232","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.168","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.93","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.11","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.2","versionStartIncluding":"4.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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<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"}],"metrics":[{"cvssV3_1":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-15T12:22:55.595Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2022-49738","datePublished":"2025-03-27T16:42:50.951Z","dateReserved":"2025-03-27T16:39:17.986Z","dateUpdated":"2026-08-15T12:22:55.595Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-03-27 17:15:38","lastModifiedDate":"2026-08-15 13:17:26","problem_types":["CWE-125","CWE-125 CWE-125 Out-of-bounds 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in is_alive()","CVE":"CVE-2022-49738","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"49738","Ordinal":"1","NoteData":"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","Type":"Description","Title":"f2fs: fix to do sanity check on i_extra_isize in is_alive()"}]}}}