Medium [CVE-2026-89574] Linux kernel: dm array out-of-bounds read due to insufficient header validation
This medium-severity Red Hat Linux advisory covers CVE-2026-89574.
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Summary
A flaw was found in the Linux kernel's device mapper (dm) array component. Insufficient validation of array block headers during read operations allows a local attacker to craft a malicious on-disk `nr_entries` value.
This can lead to an out-of-bounds read from the `dm-bufio` buffer, potentially resulting in memory corruption or information disclosure. Red Hat severity: Moderate — CVSS 5.1 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H).
Weakness: CWE-125.
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 48 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 48 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 48 minutes ago·verify at source
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