netfilter: bridge: eb_tables: close module init race (CVE-2026-64076) | HOL Guard CVE

High · CVSS 7.8CVE-2026-64076

netfilter: bridge: eb_tables: close module init race

Answer in brief

CVE-2026-64076 records a High severity (CVSS 7.8) vulnerability in netfilter: bridge: eb_tables: close module init race. 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 Jul 19, 2026Updated Sep 3, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. 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.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc3::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=5b53951cfc85329d29df9d07b1e905f4563546a5 <c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4 \|\| >=5b53951cfc85329d29df9d07b1e905f4563546a5 <02d999dc69b3918dba2414932b5d95f1f75c76cb \|\| >=5b53951cfc85329d29df9d07b1e905f4563546a5 <27414ff1b287ea9a2a11675149ec28e05539f3cc	c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4, 02d999dc69b3918dba2414932b5d95f1f75c76cb, 27414ff1b287ea9a2a11675149ec28e05539f3cc
Linux/Linuxgeneric	5.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: eb_tables: close module init race sashiko reports for unrelated patch: Does the core ebtables initialization in ebtables.c suffer from a similar race? Once nf_register_sockopt() completes, the sockopts are exposed globally. sockopt has to be registered last, just like in ip/ip6/arptables.

Quoted source text, attributed separately from HOL analysis.