CVE-2026-89694High· 7.0▾ TwilightA flaw was found in the Linux kernel's NFSv4.2 server (nfsd). An authenticated NFSv4.2 client could exploit a vulnerability in the `manage_cpntf_state()` function by guessing a state identifier. This improper ownership check allows the cli…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0 · 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%
— → 5.3
none → medium
— → 5.3
none → medium
0.2% → 0.2%
— → 5.3
none → medium
Last analysed / modified upstream
5.3 → 7
medium → high
A flaw was found in the Linux kernel's NFSv4.2 server (nfsd). An authenticated NFSv4.2 client could exploit a vulnerability in the manage_cpntf_state() function by guessing a state identifier. This improper ownership check allows the client to cancel and free another client's copy-notify stateid, leading to a Denial of Service (DoS) for the legitimate client.
kernel: nfsd: check client ownership when cancelling a copy-notify stateid — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.
Affected:
No fix planned:
Not affected:
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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