efivarfs: Rate limit statfs() handler

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89604
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:45 UTC
Updated2026-09-11 20:19:45 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 git Not specified
CNA Linux Linux affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 92895a14329cc9533e2a74a265214f690ba3851a git Not specified
CNA Linux Linux affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 0dbc2e94b81df5a1264068b6ed3605c654b8afcb git Not specified
CNA Linux Linux affected d86ff3333cb1d5f42d8898fb5fdb304e143c0237 b2326338dc683e8c1067c0cbf7a47986c4190902 git Not specified
CNA Linux Linux affected 115409cbb6a296d73702a62c54c5b1b11cb88b3d git Not specified
CNA Linux Linux affected 6.1.178 6.2 semver Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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