Medium [CVE-2026-89752] Linux kernel: Denial of Service in memcg due to stale memory limit during reclaim
This medium-severity Red Hat Linux advisory covers CVE-2026-89752.
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Summary
A flaw was found in the Linux kernel's memory cgroup (memcg) component. When multiple file operations concurrently update `memory.high` or `memory.max` files in `kernfs`, a writer can continue reclaiming memory towards an outdated target.
This can lead to an indefinite loop, causing a denial of service (DoS) by blocking the writer and repeatedly incrementing the Out-Of-Memory (OOM) event counter without terminating processes. Red Hat severity: Moderate — CVSS 4.1 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-367.
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 30 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 30 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 30 minutes ago·verify at source
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