CVE-2026-89695High· 7.0▾ TwilightA flaw was found in the Linux kernel's Network File System Daemon (nfsd). The `nfsd4_decode_posixacl()` function, responsible for decoding POSIX Access Control Lists (ACLs), does not properly cap the entry count received from a client. A r…
▾ 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%
— → 5.3
none → medium
— → 7.5
none → high
7.5 → 5.3
high → medium
5.3 → 7.5
medium → high
7.5 → 5.3
high → medium
Last analysed / modified upstream
5.3 → 7
medium → high
A flaw was found in the Linux kernel's Network File System Daemon (nfsd). The nfsd4_decode_posixacl() function, responsible for decoding POSIX Access Control Lists (ACLs), does not properly cap the entry count received from a client. A remote attacker can exploit this by sending a specially crafted ACL with an excessively large entry count, leading to unbounded CPU usage during an O(n^2) sorting operation. This can result in a Denial of Service (DoS) for the affected server.
kernel: nfsd: cap decoded POSIX ACL count to bound sort cost — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.
Affected:
No fix planned:
Fix deferred
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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