Medium [CVE-2026-89754] Linux kernel: Memory corruption via out-of-bounds write in mm/pagewalk
This medium-severity Red Hat Linux advisory covers CVE-2026-89754.
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Summary
A flaw was found in the Linux kernel's memory management (mm/pagewalk) component. An issue in the `walk_pmd_range()` function, where a stale `walk->action` state is not properly reset, can lead to duplicate walk callbacks.
A local attacker could exploit this to trigger an out-of-bounds write, potentially causing memory corruption and system instability. Red Hat severity: Important — CVSS 6.3 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H).
Weakness: CWE-787.
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 40 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 40 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 40 minutes ago·verify at source
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