SB20260424183 - Use-after-free in Linux kernel tls

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260424183

SB20260424183 - Use-after-free in Linux kernel tls

Published: April 24, 2026

Security Bulletin ID SB20260424183
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-2026-31533)

CWE-ID: CWE-416 - Use After Free

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


The vulnerability allows a local user to cause a use-after-free.

The vulnerability exists due to use-after-free in tls_do_encryption() when handling an -EBUSY error path during asynchronous encryption processing. A local user can trigger asynchronous encryption and a subsequent sendmsg to cause a use-after-free.

The issue occurs because a pending cryptd callback may access a freed tls_rec after cleanup state is corrupted by double handling of encrypt_pending and scatterlist restoration.


Remediation

Install update from vendor's website.

References