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CVE-2026-89834

f2fs: fix to migrate all curseg types during free_segment_range PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to migrate all curseg types during free_segment_range In free_segment_range(), the curseg evacuation loop only iterates up to NR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg types such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC. Even though these in-memory curseg types are not saved in the on-disk checkpoint header, they still occupy active physical segments at runtime. If an active in-memory curseg happens to be allocated within the segment range being truncated during filesystem shrink, failing to evacuate it will cause subsequent writes to the curseg attempting out-of-bounds I/O on the truncated storage range. Fix this by expanding the curseg evacuation loop upper bound to NR_CURSEG_TYPE to ensure all active curseg types are safely migrated out of the target range.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected d0b9e42ab6155dc05fc83f00af9f45d4dd02264d before d358d2fc6be11eefde5eb1286f1c43a6d0330db6; affected d0b9e42ab6155dc05fc83f00af9f45d4dd02264d before 3b85edf3391f3e1f624f409a7d2d239885f567b7; affected d0b9e42ab6155dc05fc83f00af9f45d4dd02264d before b8ae1228c153622afa71a179c9d4dc268117e0f0; affected d0b9e42ab6155dc05fc83f00af9f45d4dd02264d before b9776094aa7118e8e5dfdcd791ffc8330c5ca408; affected d0b9e42ab6155dc05fc83f00af9f45d4dd02264d before 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1
Linux / Linuxaffected 5.10; unaffected 0 before 5.10; unaffected 6.6.160 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References