netfilter: x_tables: add and use xtables_unregister_table_exit (CVE-2026-64078) | HOL Guard CVE

High · CVSS 7.8CVE-2026-64078

netfilter: x_tables: add and use xtables_unregister_table_exit

Answer in brief

CVE-2026-64078 records a High severity (CVSS 7.8) vulnerability in netfilter: x_tables: add and use xtables_unregister_table_exit. 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	>=fdacd57c79b79a03c7ca88f706ad9fb7b46831c1 <86ee5bc9c0f0e652e19f395675a432de11b75514 \|\| >=fdacd57c79b79a03c7ca88f706ad9fb7b46831c1 <8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf \|\| >=fdacd57c79b79a03c7ca88f706ad9fb7b46831c1 <b4597d5fd7d2f8cebfffd40dffb5e003cc78964c	86ee5bc9c0f0e652e19f395675a432de11b75514, 8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf, b4597d5fd7d2f8cebfffd40dffb5e003cc78964c
Linux/Linuxgeneric	5.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 86ee5bc9c0f0e652e19f395675a432de11b75514 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: x_tables: add and use xtables_unregister_table_exit Previous change added xtables_unregister_table_pre_exit to detach the table from the packetpath and to unlink it from the active table list. In case of rmmod, userspace that is doing set/getsockopt for this table will not be able to re-instantiate the table: 1. The larval table has been removed already 2. existing instantiated table is no longer on the xt pernet table list. This adds the second stage helper: unlink the table from the dying list, free the hook ops (if any) and do the audit notification. It replaces xt_unregister_table().

Quoted source text, attributed separately from HOL analysis.