{"id":"CVE-2026-89834","title":"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), …","summary":"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), …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d < 3b85edf3391f3e1f624f409a7d2d239885f567b7","Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d < b8ae1228c153622afa71a179c9d4dc268117e0f0","Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d < b9776094aa7118e8e5dfdcd791ffc8330c5ca408","Linux >= d0b9e42ab6155dc05fc83f00af9f45d4dd02264d < 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1","Linux 5.10"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T11:16:50.180","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89834","references":[{"url":"https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.999Z","epss":0.002,"epssPercentile":0.10119,"slug":"CVE-2026-89834","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}