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.
Published: 2026-07-19
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

Based on the description, it is inferred that a race condition exists in the initialization of the eb_tables netfilter bridge module. During module startup the socket options are registered globally before all necessary components are fully initialized, exposing configuration data to privileged modules prematurely. This race could allow a local attacker to manipulate or read socket options before the module is fully ready, potentially compromising network filtering and elevating privileges. The flaw stems from improper synchronization during module startup and is a classic race‑condition weakness.

Affected Systems

All Linux kernel releases that include the ebtables bridge module without the patch commit referenced in the CVE. The vulnerability applies to any Linux system with ebtables enabled, regardless of distribution.

Risk and Exploitability

The CVSS score of 7.8 classifies it as high severity. The EPSS score is below 1%, indicating a low probability of exploitation in the wild, and it is not listed in CISA KEV, meaning no known active exploitation. Based on the description, it is inferred that the attack vector would be local, requiring local system access or the ability to load kernel modules. If the race is triggered, an attacker could leak sensitive socket option configurations or interfere with packet filtering, which could be leveraged for privilege escalation or denial of service.

Generated by OpenCVE AI on July 30, 2026 at 20:43 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply a Linux kernel update that incorporates the ebtables module patch from commit 02d999dc6
  • If a timely update is not available, unload or disable the ebtables kernel module until the system can be patched
  • Reboot the system after applying the kernel update to ensure the patched module loads correctly

Generated by OpenCVE AI on July 30, 2026 at 20:43 UTC.

Tracking

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Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8593-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8603-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-8618-1 Linux kernel vulnerabilities
History

Tue, 21 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-820
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 20 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Sun, 19 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
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.
Title netfilter: bridge: eb_tables: close module init race
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-05T12:38:56.509Z

Reserved: 2026-07-19T07:54:57.031Z

Link: CVE-2026-64076

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-19T00:00:00Z

Links: CVE-2026-64076 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-07-30T20:45:17Z

Weaknesses