CVE-2026-89604
In the Linux kernel, the following vulnerability has been resolved: efivarfs: Rate limit statfs() handler Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs. So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.
Affected versions
Linux kernel versions
6.1.178,
6.5
and later are affected. Fixed in
6.1.188,
6.6.157,
6.12.109,
6.18.50,
7.2.4,
7.3-rc1
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-89604?
CVE-2026-89604 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.1.178 onward and has been patched in 6.1.188, 6.6.157, 6.12.109 and others. CVE-2026-89604 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-89604?
Yes. CVE-2026-89604 has been patched. Fixed versions include 6.1.188, 6.6.157, 6.12.109 and others. If you are running Linux kernel 6.1.178 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-89604 actively exploited?
No. CVE-2026-89604 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.