Medium [CVE-2026-89537] Linux kernel: Memory corruption in SUNRPC due to short Kerberos MIC tokens
This medium-severity Red Hat Linux advisory covers CVE-2026-89537.
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Summary
A flaw was found in the Linux kernel's SUNRPC implementation, specifically within the `gss_krb5_verify_mic_v2` function. A remote malicious Network File System (NFS) server could provide a specially crafted, short Kerberos Message Integrity Code (MIC) token.
This could lead to the kernel reading past an allocated memory buffer, potentially causing a denial of service or information disclosure. Red Hat severity: Moderate — CVSS 6.4 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/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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