SB2026081516 - Use-after-free in Linux kernel rxrpc

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026081516

SB2026081516 - Use-after-free in Linux kernel rxrpc

Published: August 15, 2026

Security Bulletin ID SB2026081516
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-2026-74436)

CWE-ID: CWE-416 - Use After Free

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 attacker to cause a denial of service.

The vulnerability exists due to a use-after-free in rxrpc_kernel_charge_accept() and the rxrpc service backlog handling when concurrent socket teardown and kernel accept preallocation occur. A local attacker can trigger concurrent operations that reuse a freed backlog structure to cause a denial of service.

The issue arises from a race condition between kernel preallocation work and socket teardown in the RxRPC subsystem.


Remediation

Install update from vendor's website.

References