CVE-2026-89604

efivarfs: Rate limit statfs() handler

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	115409cbb6a296d73702a62c54c5b1b11cb88b3d to before 97d71ebee48cd1b29091762b3e5cca4f815dd84cAffected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 3cd611c9f1dbcc116c8af5112e3c1783c8cde2aeAffected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41Affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 92895a14329cc9533e2a74a265214f690ba3851aAffected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 0dbc2e94b81df5a1264068b6ed3605c654b8afcbAffected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before b2326338dc683e8c1067c0cbf7a47986c4190902Affected 6.1.178 to before 6.1.188Affected
LinuxLinux	6.5Affected before 6.5Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

115409cbb6a296d73702a62c54c5b1b11cb88b3d to before 97d71ebee48cd1b29091762b3e5cca4f815dd84cAffected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 3cd611c9f1dbcc116c8af5112e3c1783c8cde2aeAffected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41Affected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 92895a14329cc9533e2a74a265214f690ba3851aAffected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before 0dbc2e94b81df5a1264068b6ed3605c654b8afcbAffected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237 to before b2326338dc683e8c1067c0cbf7a47986c4190902Affected
6.1.178 to before 6.1.188Affected

LinuxLinux

6.5Affected
before 6.5Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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