Medium [CVE-2026-89578] dm-io vulnerability leads to denial of service via I/O hang
This medium-severity Red Hat Linux advisory covers CVE-2026-89578.
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Summary
A flaw was found in the Linux kernel's device mapper I/O (dm-io) component. When handling DM_IO_BIO requests, incorrect sector-based accounting for misaligned direct I/O buffers could lead to an infinite loop.
This issue can cause I/O operations to hang indefinitely, resulting in a denial of service (DoS) for the affected system. A local attacker could exploit this by performing specific misaligned direct I/O operations to a dm-mirror device.
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-835.
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 56 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 56 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 56 minutes ago·verify at source
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