CVE-2026-89661Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's Network File System Daemon (NFSD). A local administrator with CAP_SYS_ADMIN capabilities can trigger a use-after-free vulnerability by writing to /proc/fs/nfsd/unlock_filesystem after the NFSD server …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · 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%
— → 4.1
none → medium
— → 4.1
none → medium
— → 4.1
none → medium
Last analysed / modified upstream
4.1 → 5.5
A flaw was found in the Linux kernel's Network File System Daemon (NFSD). A local administrator with CAP_SYS_ADMIN capabilities can trigger a use-after-free vulnerability by writing to /proc/fs/nfsd/unlock_filesystem after the NFSD server has shut down. This can lead to memory corruption, potentially causing a denial of service.
kernel: NFSD: Prevent post-shutdown use-after-free in unlock_filesystem — 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.
CVE-2026-89668High· 7.0kernel: nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd() (CVE-2026-89668)
CVE-2026-89670High· 7.0kernel: nfsd: hold rcu across localio cmpxchg retry (CVE-2026-89670)
CVE-2026-89689High· 7.0kernel: nfsd: don't free session slots that are still in use (CVE-2026-89689)
CVE-2026-89747High· 7.0kernel: tracing: Fix use-after-free in trace_pipe read on sub-buffer order change (CVE-2026-89747)
CVE-2026-89769Medium· 5.5kernel: clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path (CVE-2026-89769)
CVE-2026-89469Medium· 5.5kernel: power: supply: lp8727: fix use-after-free in lp8727_release_irq() (CVE-2026-89469)