SB20260828188 - Out-of-bounds read in Linux kernel netfilter

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Main Vulnerability Database SB20260828188

SB20260828188 - Out-of-bounds read in Linux kernel netfilter

Published: August 28, 2026

Security Bulletin ID SB20260828188
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-80603)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause incorrect connection tracking state.

The vulnerability exists due to an out-of-bounds read in the parse_dcc() function in nf_conntrack_irc when parsing DCC command data without a newline present. A remote attacker can send specially crafted IRC DCC command data to cause incorrect connection tracking state.

The stray read may consume an uninitialized or stale byte, which can lead to an incorrect DCC IP address or port being recorded in the conntrack expectation.


Remediation

Install update from vendor's website.

References