CVE-2026-89767Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's overlay file system (overlayfs). An unprivileged local user can trigger a specific error condition during the creation of a new directory. This error causes the system to incorrectly release a lock on…
▾ 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%
— → 5.5
none → medium
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none → medium
— → 7.8
none → high
7.8 → 5.5
high → medium
5.5 → 7.8
medium → high
7.8 → 5.5
high → medium
Last analysed / modified upstream
A flaw was found in the Linux kernel's overlay file system (overlayfs). An unprivileged local user can trigger a specific error condition during the creation of a new directory. This error causes the system to incorrectly release a lock on the parent directory and a reference to the new directory entry twice. This double release can lead to subsequent attempts to create directories under the same parent to become unresponsive, effectively causing a denial of service (DoS) for those operations.
kernel: ovl: fix double end_creating() on the casefold-mismatch path — 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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