CVE-2026-89604Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's efivarfs component. An unprivileged local user can exploit this by repeatedly calling the `statfs()` handler on the `efivarfs` mount point. This action triggers a flood of calls to the `QueryVariableI…
▾ 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%
— → 4.7
none → medium
— → 4.7
none → medium
0.2% → 0.2%
— → 4.7
none → medium
Last analysed / modified upstream
4.7 → 5.5
A flaw was found in the Linux kernel's efivarfs component. An unprivileged local user can exploit this by repeatedly calling the statfs() handler on the efivarfs mount point. This action triggers a flood of calls to the QueryVariableInfo() runtime service, which is particularly costly on x86 systems. The excessive calls can lead to significant performance degradation, potentially resulting in a Denial of Service (DoS).
kernel: efivarfs: Rate limit statfs() handler — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-16.
Affected:
No fix planned:
Not affected:
Fix deferred
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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