---
id: CVE-2026-89604
title: 'efivarfs: Rate limit statfs() handler'
summary: |-
  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 …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-770
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 115409cbb6a296d73702a62c54c5b1b11cb88b3d <
    97d71ebee48cd1b29091762b3e5cca4f815dd84c
  - >-
    Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <
    3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae
  - >-
    Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <
    8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41
  - >-
    Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <
    92895a14329cc9533e2a74a265214f690ba3851a
  - >-
    Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <
    0dbc2e94b81df5a1264068b6ed3605c654b8afcb
  - >-
    Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <
    b2326338dc683e8c1067c0cbf7a47986c4190902
  - Linux >= 6.1.178 < 6.1.188
  - Linux 6.5
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:35.476Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89604'
references:
  - url: 'https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c'
  - url: 'https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae'
  - url: 'https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41'
  - url: 'https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a'
  - url: 'https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb'
  - url: 'https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89604.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89604'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532362'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89604'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89604'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89604.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00211
epssPercentile: 0.11324
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

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

- `Linux >= 115409cbb6a296d73702a62c54c5b1b11cb88b3d < 97d71ebee48cd1b29091762b3e5cca4f815dd84c`
- `Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 < 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae`
- `Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 < 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41`
- `Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 < 92895a14329cc9533e2a74a265214f690ba3851a`
- `Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 < 0dbc2e94b81df5a1264068b6ed3605c654b8afcb`
- `Linux >= d86ff3333cb1d5f42d8898fb5fdb304e143c0237 < b2326338dc683e8c1067c0cbf7a47986c4190902`
- `Linux >= 6.1.178 < 6.1.188`
- `Linux 6.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89604.json)