Medium [CVE-2026-89541] Linux kernel (SUNRPC): Out-of-bounds read via crafted RPCSEC_GSS reply
This medium-severity Red Hat Linux advisory covers CVE-2026-89541.
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Summary
A flaw was found in the Linux kernel. Specifically, an integer overflow vulnerability exists in the `gss_unwrap_resp_priv()` function within the SUNRPC component.
This flaw occurs when validating the length of RPCSEC_GSS opaque data. A malicious krb5p Network File System (NFS) server can send a specially crafted RPCSEC_GSS reply, leading to an out-of-bounds read.
This could potentially result in information disclosure or a denial of service (DoS) on the client system. Red Hat severity: Important — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H).
Weakness: CWE-125.
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 2 hours 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 2 hours 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 2 hours ago·verify at source
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