# CVE-2026-89566

## Summary

- **CVE ID:** CVE-2026-89566
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## 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.

## Affected Products

- Linux — Linux (b98dba273a0e47dbfade89c9af73c5b012a4eabb)
- Linux — Linux (9c31bb2684f8035beca0275349d19d679b679ffb)
- Linux — Linux (5fda50e262e65bd553ff777c4b280afd1495a18b)
- Linux — Linux (557fda9ed70ebf8eda2620ba3d746215285a1303)
- Linux — Linux (5.15.129)
- Linux — Linux (6.1.50)
- Linux — Linux (6.4.13)
- Linux — Linux (6.5)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290)
- [CNA](https://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c)
- [CNA](https://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4)
- [CNA](https://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._