CVE-2026-89655High· 7.0▾ TwilightA flaw was found in the Linux kernel's Ceph file system component. A race condition exists in the `__kick_flushing_caps()` function during the handling of capability messages. This allows a separate process to free a data structure (`cf en…
▾ 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 Ceph file system component. A race condition exists in the __kick_flushing_caps() function during the handling of capability messages. This allows a separate process to free a data structure (cf entry) while __kick_flushing_caps() is still iterating over it. This use-after-free (UAF) vulnerability can lead to system instability, a denial of service (DoS), or potentially privilege escalation for a local attacker.
kernel: ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
Affected:
No fix planned:
Not affected:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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