SB2026040684 - Use-after-free in Linux kernel smc

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Main Vulnerability Database SB2026040684

SB2026040684 - Use-after-free in Linux kernel smc

Published: April 6, 2026

Security Bulletin ID SB2026040684
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-2026-23450)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a race condition leading to a NULL pointer dereference and use-after-free in smc_tcp_syn_recv_sock() when processing TCP connection requests concurrently with closing an SMC listen socket. A remote attacker can send network traffic that triggers the TCP handshake path to cause a denial of service.

The issue occurs because sk_user_data may become NULL or reference a freed smc_sock while the TCP receive path accesses it, resulting in a kernel panic.


Remediation

Install update from vendor's website.

References