---
cve: "CVE-2026-89566"
severity: "LOW"
cvss: 3.1
epss: "20%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:40"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T19:02:58+02:00"
---

# CVE-2026-89566

> 3.1 LOW

## Beschreibung

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.

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.109
- Kernel ≥ 6.18.50
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290>
- <https://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c>
- <https://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4>
- <https://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89566) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_