f2fs: fix to migrate all curseg types during free_segment_range (CVE-2026-89834) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89834

f2fs: fix to migrate all curseg types during free_segment_range

Answer in brief

CVE-2026-89834 records a Unknown severity vulnerability in f2fs: fix to migrate all curseg types during free_segment_range. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <3b85edf3391f3e1f624f409a7d2d239885f567b7 \|\| >=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <b8ae1228c153622afa71a179c9d4dc268117e0f0 \|\| >=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <b9776094aa7118e8e5dfdcd791ffc8330c5ca408 \|\| >=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1	3b85edf3391f3e1f624f409a7d2d239885f567b7, b8ae1228c153622afa71a179c9d4dc268117e0f0, b9776094aa7118e8e5dfdcd791ffc8330c5ca408, 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1
Linux/Linuxgeneric	5.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3b85edf3391f3e1f624f409a7d2d239885f567b7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.