CVE-2026-89635Medium· 5.5▾ SunlitA flaw was found in ksmbd, a component of the Linux kernel. An authenticated attacker could exploit a use-after-free vulnerability by manipulating durable handles and oplocks during session reconnection. When two sessions hold durable hand…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · 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
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 → 5.5
A flaw was found in ksmbd, a component of the Linux kernel. An authenticated attacker could exploit a use-after-free vulnerability by manipulating durable handles and oplocks during session reconnection. When two sessions hold durable handles on the same file and both disconnect, reconnecting one of them can incorrectly adopt the other session's oplock. If the adopting session is then destroyed, the foreign oplock still points to the freed session, leading to a use-after-free when dereferenced. This can result in a system crash and a denial of service.
kernel: ksmbd: only rebind the reopened file's own oplock on durable reconnect — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
Not affected:
Refer to the advisory for fix availability.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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