Medium [CVE-2026-89576] Linux kernel dm-era: Denial of Service due to metadata block leak
This medium-severity Red Hat Linux advisory covers CVE-2026-89576.
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Summary
A flaw was found in the Linux kernel's device-mapper era (dm-era) component. When a snapshot operation fails, a block of metadata is allocated but not properly freed.
This leads to a permanent leak of system resources with each failed attempt. Over time, this resource exhaustion can result in a Denial of Service (DoS), causing the system to become unresponsive or crash.
Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-911.
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 49 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 49 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 49 minutes ago·verify at source
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