# CVE-2026-89604

## Summary

- **CVE ID:** CVE-2026-89604
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 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.

## Affected Products

- Linux — Linux (d86ff3333cb1d5f42d8898fb5fdb304e143c0237)
- Linux — Linux (115409cbb6a296d73702a62c54c5b1b11cb88b3d)
- Linux — Linux (6.1.178)
- Linux — Linux (6.5)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41)
- [CNA](https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a)
- [CNA](https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb)
- [CNA](https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902)
- [CNA](https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c)
- [CNA](https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 10.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._