Answer in brief
CVE-2026-89566 records a Unknown severity vulnerability in jbd2: check need_resched() when skipping busy checkpoint buffers. 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.
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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=b98dba273a0e47dbfade89c9af73c5b012a4eabb <f83c23286e54180cdc83a36463a60003534cc290 || >=b98dba273a0e47dbfade89c9af73c5b012a4eabb <f9182a85991a0ad5cd2940df6db75f40ad90028c || >=b98dba273a0e47dbfade89c9af73c5b012a4eabb <595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4 || >=b98dba273a0e47dbfade89c9af73c5b012a4eabb <f213e12ff5c9590b1034ae8da0e6d09665c772d0 || 9c31bb2684f8035beca0275349d19d679b679ffb || 5fda50e262e65bd553ff777c4b280afd1495a18b || 557fda9ed70ebf8eda2620ba3d746215285a1303 || >=5.15.129 <5.16 || >=6.1.50 <6.2 || >=6.4.13 <6.5 | f83c23286e54180cdc83a36463a60003534cc290, f9182a85991a0ad5cd2940df6db75f40ad90028c, 595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4, f213e12ff5c9590b1034ae8da0e6d09665c772d0, 5.16, 6.2, 6.5 |
| Linux/Linuxgeneric | 6.5 | Not reported |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: jbd2: check need_resched() when skipping busy checkpoint buffers journal_shrink_one_cp_list() skips busy checkpoint buffers when called with JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also skips the need_resched() check at the end of the loop body. Consequently, when a checkpoint list contains mostly busy buffers, the shrinker can walk the entire list while holding journal->j_list_lock, even when a reschedule has been requested. Large checkpoint lists under memory pressure can therefore cause long lock hold times and leave other CPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls. Route the busy-buffer path through the need_resched() check so that the shrinker can release j_list_lock and reschedule promptly, restoring parity with the clean-buffer path, which already checks need_resched(). This does not change which checkpoint buffers are eligible for removal.
Quoted source text, attributed separately from HOL analysis.