CVE-2026-89662High· 7.0▾ TwilightA flaw was found in the Linux kernel's Network File System Daemon (NFSD). During client teardown, a race condition can occur where a lock owner is freed while still being referenced, leading to a use-after-free vulnerability. This can resu…
▾ 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%
— → 5.3
none → medium
— → 5.3
none → medium
— → 9.8
none → critical
9.8 → 5.3
critical → medium
5.3 → 9.8
medium → critical
Last analysed / modified upstream
0.2% → 0.7%
9.8 → 7
critical → high
A flaw was found in the Linux kernel's Network File System Daemon (NFSD). During client teardown, a race condition can occur where a lock owner is freed while still being referenced, leading to a use-after-free vulnerability. This can result in a NULL dereference, potentially causing a system crash and a denial of service.
kernel: NFSD: Prevent lock owner use-after-free during client teardown — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
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.
CVE-2026-89686High· 7.0kernel: nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke (CVE-2026-89686)
CVE-2026-89709High· 7.0kernel: lockd, nfsd: RCU-protect nlmsvc_ops dispatch (CVE-2026-89709)
CVE-2026-89442Medium· 5.5kernel: platform/x86: ISST: Validate socket ID in clos_assoc ioctl (CVE-2026-89442)
CVE-2026-89696Medium· 5.5kernel: nfsd: block non-SAVEFH ops after FOREIGN PUTFH to prevent NULL deref (CVE-2026-89696)
CVE-2026-80963Medium· 5.5kernel: dm-stats: fix a crash if allocation of per-cpu data fails (CVE-2026-80963)
CVE-2026-80984Medium· 5.5kernel: net/smc: do not dereference an unset send buffer on the SMC-D teardown path (CVE-2026-80984)