Medium [CVE-2026-89634] Linux kernel: SMB client out-of-bounds read and denial of service via ALIGN overflow
This medium-severity Red Hat Linux advisory covers CVE-2026-89634 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the Server Message Block (SMB) client within the Linux kernel. An integer overflow in the ALIGN() function, specifically within the symlink_data() error context loop, can lead to an out-of-bounds read.
This issue allows a malicious SMB server to cause a denial of service (DoS) by triggering an infinite loop or potentially disclose sensitive information. Red Hat severity: Important — CVSS 5.4 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:H).
Weakness: CWE-125. Affected Red Hat products: Red Hat OpenShift Container Platform 4.
Red Hat does not currently list a fixing RHSA for this CVE.
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 32 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 32 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 32 minutes ago·verify at source
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