Medium [CVE-2026-89584] Denial of Service due to improper user space vector validation in block layer
This medium-severity Red Hat Linux advisory covers CVE-2026-89584.
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Summary
A flaw was found in the Linux kernel's block layer. This vulnerability arises from insufficient validation of user-space data structures (vectors) against the device's Direct Memory Access (DMA) alignment requirements.
A local attacker could exploit this by providing misaligned data, causing the system to reject the input with an error and potentially leading to 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-1288.
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 18 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 18 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 18 minutes ago·verify at source
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