SB20260824220 - Out-of-bounds write in Linux kernel tls

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260824220

SB20260824220 - Out-of-bounds write in Linux kernel tls

Published: August 24, 2026

Security Bulletin ID SB20260824220
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) Out-of-bounds write (CVE-ID: CVE-2026-74610)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.8 [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]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in tls_sw_sendmsg_locked() and the plaintext sk_msg ring handling in net/tls/tls_sw.c when processing sendmsg and later splice operations on a loopback TCP socket with the "tls" ULP attached. A local user can trigger the ring to appear empty after wrapping and overwrite live entries to cause a denial of service.

The issue can lead to a kernel NULL pointer dereference when a full plaintext sk_msg ring is left unpushed.


Remediation

Install update from vendor's website.

References