{"id":"CVE-2026-89834","published":"2026-09-16T11:16:50.180","lastModified":"2026-09-16T11:16:50.180","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7","tags":[]},{"url":"https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1","tags":[]},{"url":"https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0","tags":[]},{"url":"https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}