CVE-2026-89834
UnknownSummary
In the Linux kernel, f2fs free_segment_range() 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. An active in-memory curseg within the truncated segment range will not be evacuated.
Risk Assessment
Subsequent writes to the un-evacuated curseg may cause out-of-bounds I/O on the truncated storage range, leading to data corruption or crashes. Requires local access and filesystem shrink operations.
Recommendation
Update the Linux kernel to a version containing the fix that expands the curseg evacuation loop upper bound to NR_CURSEG_TYPE.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS