SB2026102212 - Use-after-free in Linux kernel sched

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Main Vulnerability Database SB2026102212

SB2026102212 - Use-after-free in Linux kernel sched

Published: October 22, 2026

Security Bulletin ID SB2026102212
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-2026-98442)

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 cause a denial of service or potentially corrupt kernel memory.

The vulnerability exists due to use-after-free in the Linux kernel connection-tracking action in net/sched/act_ct.c when connection-tracking extensions are reallocated after a helper creates an expectation for an unconfirmed connection. A remote attacker can trigger processing of network traffic that exercises this sequence to leave a stale pointer in the expectations list, potentially causing a kernel crash or memory corruption when the expectation is removed.


Remediation

Install update from vendor's website.

References