{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89834","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.769Z","datePublished":"2026-09-16T10:31:07.093Z","dateUpdated":"2026-09-16T10:31:07.093Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-16T10:31:07.093Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to migrate all curseg types during free_segment_range\n\nIn free_segment_range(), the curseg evacuation loop only iterates up to\nNR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg\ntypes such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC.\n\nEven though these in-memory curseg types are not saved in the on-disk\ncheckpoint header, they still occupy active physical segments at runtime.\nIf an active in-memory curseg happens to be allocated within the segment\nrange being truncated during filesystem shrink, failing to evacuate it\nwill cause subsequent writes to the curseg attempting out-of-bounds I/O\non the truncated storage range.\n\nFix this by expanding the curseg evacuation loop upper bound to\nNR_CURSEG_TYPE to ensure all active curseg types are safely migrated\nout of the target range."}],"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":"d0b9e42ab6155dc05fc83f00af9f45d4dd02264d","lessThan":"3b85edf3391f3e1f624f409a7d2d239885f567b7","status":"affected","versionType":"git"},{"version":"d0b9e42ab6155dc05fc83f00af9f45d4dd02264d","lessThan":"b8ae1228c153622afa71a179c9d4dc268117e0f0","status":"affected","versionType":"git"},{"version":"d0b9e42ab6155dc05fc83f00af9f45d4dd02264d","lessThan":"b9776094aa7118e8e5dfdcd791ffc8330c5ca408","status":"affected","versionType":"git"},{"version":"d0b9e42ab6155dc05fc83f00af9f45d4dd02264d","lessThan":"8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1","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":"5.10","status":"affected"},{"version":"0","lessThan":"5.10","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.51","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.5","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","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":"5.10","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7"},{"url":"https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0"},{"url":"https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408"},{"url":"https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1"}],"title":"f2fs: fix to migrate all curseg types during free_segment_range","x_generator":{"engine":"bippy-1.2.0"}}}}