CVE-2026-89688High· 7.0▾ TwilightA 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
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% → 0.6%
— → 5.3
none → medium
— → 9.8
none → critical
9.8 → 5.3
critical → medium
5.3 → 9.8
medium → critical
9.8 → 5.3
critical → medium
Last analysed / modified upstream
5.3 → 7
medium → high
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 2026-09-16.
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-2026-80947High· 7.0kernel: wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop (CVE-2026-80947)
CVE-2026-80981High· 7.0kernel: net/smc: fix use-after-free of the LLC qentry in smc_llc_srv_add_link() (CVE-2026-80981)
CVE-2026-89441Medium· 5.5kernel: mmc: via-sdmmc: cancel card-detect work on remove (CVE-2026-89441)
CVE-2026-89675High· 7.0kernel: nfsd: fix UAF in async copy cancel and shutdown (CVE-2026-89675)
CVE-2026-89478High· 7.0kernel: sctp: drop a chunk if its transport was removed (CVE-2026-89478)
CVE-2026-89479High· 7.0kernel: sctp: stop processing a packet once its association is deleted (CVE-2026-89479)