Medium [CVE-2026-89490] Denial of Service via readdir position truncation on 32-bit kernels
This medium-severity Red Hat Linux advisory covers CVE-2026-89490.
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Summary
A flaw was found in ocfs2, the Oracle Cluster File System, within the Linux kernel. On 32-bit kernels, an error in how directory cookie positions are calculated can lead to truncation when a directory exceeds 4 Gigabytes (GiB) in size.
This truncation causes the system to repeatedly re-enumerate already-returned directory entries indefinitely. An attacker could exploit this to cause a Denial of Service (DoS) by preventing proper directory listing operations.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-190.
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 47 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 47 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 47 minutes ago·verify at source
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