jbd2: check need_resched() when skipping busy checkpoint buffers
Summary
| CVE | CVE-2026-89566 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-11 20:19:40 UTC |
| Updated | 2026-09-11 20:19:40 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.002000000 probability, percentile 0.099570000 (date 2026-09-14)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected b98dba273a0e47dbfade89c9af73c5b012a4eabb f83c23286e54180cdc83a36463a60003534cc290 git | Not specified |
| CNA | Linux | Linux | affected b98dba273a0e47dbfade89c9af73c5b012a4eabb f9182a85991a0ad5cd2940df6db75f40ad90028c git | Not specified |
| CNA | Linux | Linux | affected b98dba273a0e47dbfade89c9af73c5b012a4eabb 595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4 git | Not specified |
| CNA | Linux | Linux | affected b98dba273a0e47dbfade89c9af73c5b012a4eabb f213e12ff5c9590b1034ae8da0e6d09665c772d0 git | Not specified |
| CNA | Linux | Linux | affected 9c31bb2684f8035beca0275349d19d679b679ffb git | Not specified |
| CNA | Linux | Linux | affected 5fda50e262e65bd553ff777c4b280afd1495a18b git | Not specified |
| CNA | Linux | Linux | affected 557fda9ed70ebf8eda2620ba3d746215285a1303 git | Not specified |
| CNA | Linux | Linux | affected 5.15.129 5.16 semver | Not specified |
| CNA | Linux | Linux | affected 6.1.50 6.2 semver | Not specified |
| CNA | Linux | Linux | affected 6.4.13 6.5 semver | Not specified |
| CNA | Linux | Linux | affected 6.5 | Not specified |
| CNA | Linux | Linux | unaffected 6.5 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.109 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.50 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.4 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.