SB20261023196 - Use-after-free in Linux kernel net

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Main Vulnerability Database SB20261023196

SB20261023196 - Use-after-free in Linux kernel net

Published: October 23, 2026

Security Bulletin ID SB20261023196
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98968)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service by potentially crashing the kernel.

The vulnerability exists due to use-after-free in the Linux kernel AMT driver's amt_dev_xmit() function when a queued General Query is transmitted after its referenced tunnel has expired and been freed. A local user can trigger this condition when a query remains queued longer than the tunnel lifetime, causing a stale tunnel pointer stored in skb->cb to be dereferenced and potentially crashing the kernel.


Remediation

Install update from vendor's website.

References