CVE-2026-89537High· 7.0▾ TwilightA 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 Integrit…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
0.2% → 0.5%
— → 6.4
none → medium
— → 9.1
none → critical
9.1 → 6.4
critical → medium
6.4 → 9.1
medium → critical
9.1 → 6.4
critical → medium
Last analysed / modified upstream
6.4 → 7
medium → high
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.
kernel: SUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2 — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.
Affected:
No fix planned:
Out of support scope
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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