efivarfs: Rate limit statfs() handler

Answer in brief

CVE-2026-89604 records a Unknown severity vulnerability in efivarfs: Rate limit statfs() handler. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 \|\| >=d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <92895a14329cc9533e2a74a265214f690ba3851a \|\| >=d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <0dbc2e94b81df5a1264068b6ed3605c654b8afcb \|\| >=d86ff3333cb1d5f42d8898fb5fdb304e143c0237 <b2326338dc683e8c1067c0cbf7a47986c4190902 \|\| 115409cbb6a296d73702a62c54c5b1b11cb88b3d \|\| >=6.1.178 <6.2	8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41, 92895a14329cc9533e2a74a265214f690ba3851a, 0dbc2e94b81df5a1264068b6ed3605c654b8afcb, b2326338dc683e8c1067c0cbf7a47986c4190902, 6.2
Linux/Linuxgeneric	6.5	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.