SB2026042570 - NULL pointer dereference in Linux kernel rxrpc

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Main Vulnerability Database SB2026042570

SB2026042570 - NULL pointer dereference in Linux kernel rxrpc

Published: April 25, 2026

Security Bulletin ID SB2026042570
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) NULL pointer dereference (CVE-ID: CVE-2026-31638)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 improper handling of a NULL pointer reference in rxrpc_input_packet_on_conn() when processing a to-client packet after the current client call on the channel has already been torn down. A remote attacker can send a crafted packet to cause a denial of service.

The issue occurs on the client-side implicit-end error path when chan->call is NULL and no call reference was acquired.


Remediation

Install update from vendor's website.

References