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CVE-2026-89604

UnknownEPSS 0.20%

Last modified

CVE-2026-89604 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.20%

9.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 115409cbb6a296d73702a62c54c5b1b11cb88b3d, < 97d71ebee48cd1b29091762b3e5cca4f815dd84c; >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237, < 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae; >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237, < 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41; >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237, < 92895a14329cc9533e2a74a265214f690ba3851a; >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237, < 0dbc2e94b81df5a1264068b6ed3605c654b8afcb; >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237, < b2326338dc683e8c1067c0cbf7a47986c4190902; >= 6.1.178, < 6.1.188
LinuxLinux6.5

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-89604?
Severity scoring for CVE-2026-89604 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89604?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST