CVE-2026-89688Medium· 5.3▾ SunlitA flaw was found in the Linux kernel's nfsd component. During a `seqid_op` replay retry, the system incorrectly handles reference counts for stateowners, leading to a reference count underflow and a use-after-free vulnerability. This issue…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · 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%
9.8 → 5.3
critical → medium
5.3 → 9.8
medium → critical
9.8 → 5.3
critical → medium
5.3 → 7
medium → high
0.2% → 0.7%
7 → 9.8
high → critical
Last analysed / modified upstream
9.8 → 5.3
critical → medium
A flaw was found in the Linux kernel's nfsd component. During a seqid_op replay retry, the system incorrectly handles reference counts for stateowners, leading to a reference count underflow and a use-after-free vulnerability. This issue could allow an attacker to potentially cause a denial of service or execute arbitrary code.
kernel: nfsd: drop the stateid, not the stateowner, on seqid_op replay retry — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-21.
Affected:
No fix planned:
Not affected:
Out of support scope
Workarounds / mitigations:
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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