SB2026102263 - Use-after-free in Linux kernel openvswitch

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Main Vulnerability Database SB2026102263

SB2026102263 - Use-after-free in Linux kernel openvswitch

Published: October 22, 2026

Security Bulletin ID SB2026102263
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98491)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to potentially cause a denial of service through kernel memory corruption.

The vulnerability exists due to use-after-free in the Linux kernel Open vSwitch connection-tracking component when cloned packets sharing an unconfirmed connection-tracking entry are committed with different extension sets. A remote attacker can trigger packet processing through the affected commit sequence to invalidate an extension pointer in the expectation list, potentially causing a kernel crash when the entry is later destroyed.


Remediation

Install update from vendor's website.

References