Medium [CVE-2026-89567] Linux kernel: jbd2 shrinker can cause Denial of Service due to unbounded scans
This medium-severity Red Hat Linux advisory covers CVE-2026-89567.
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Summary
A flaw was found in the Linux kernel's jbd2 shrinker. This component, which manages journal buffers, does not correctly account for busy checkpoint buffers.
This oversight can cause the shrinker to hold a critical system lock for an extended period when processing many busy buffers. The prolonged lock contention can lead to system unresponsiveness, such as soft lockups or RCU stalls, ultimately resulting in a Denial of Service (DoS).
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-835.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 37 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 37 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 37 minutes ago·verify at source
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