Is there a patch available for CVE-2026-99031?

Yes, a patch is available for CVE-2026-99031. Update the affected software to the latest version immediately.

Linux CVE-2026-99031

EUVD-2026-108826

2026-10-23 Linux

GHSA-c83g-q254-qmxr

Information Disclosure Linux

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Monitor Track and reassess. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisCVE.org

In the Linux kernel, the following vulnerability has been resolved:

net: bridge: avoid recursive multicast port cleanup

br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL port groups by calling br_multicast_del_pg(). For S,G entries, that deletion calls back into br_multicast_sg_del_exclude_ports(), so a large number of STAR_EXCL ports consumes one kernel stack frame per port and can hit the stack guard page.

Keep the complete port-group deletion path for cleanup, but suppress the S,G exclude-port cleanup while that helper is already walking the same entry. Normal deletion callers retain the existing behavior.

Affected VersionsENISA

Linux patch: 7.2.11

Linux 5.10

Linux 8266a0491e92d39dc9af739e8380a0daa9b8836b <5158353121bae4f552cb677ce8c5c3ef52f93a0d

Linux patch: 6.18.57

Linux 8266a0491e92d39dc9af739e8380a0daa9b8836b <7931fb9181421953f3133b408b0f2e2b8dd68b61

Linux patch: 7.3

Linux patch: 6.6.160

Linux patch: 6.12.113

Linux 8266a0491e92d39dc9af739e8380a0daa9b8836b <2fb87c6025f90191516bee3ce14b42eb3e1cfed7

Linux 8266a0491e92d39dc9af739e8380a0daa9b8836b <695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64

Linux 8266a0491e92d39dc9af739e8380a0daa9b8836b <d109141ba14652146089ef78b32d5e4d5285ebad

Linux patch: 0

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Lifecycle Timeline

Patch available

Oct 23, 2026 - 13:17 EUVD

CVE Published

Oct 23, 2026 - 12:21 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 89% exploitable

Data Quality

3 sources

Confidence: Low

EUVD

CVE.org

EPSS MSRC

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.