SB2026042573 - Heap-based buffer overflow in Linux kernel rxrpc
Published: April 25, 2026
Security Bulletin ID
SB2026042573
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-31641)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in rxrpc_preparse_xdr_yfs_rxgk() when processing a crafted XDR token through add_key(). A local user can supply a token with oversized length values that trigger integer wraparound and overflow a heap buffer to execute arbitrary code.
The issue is reachable from an unprivileged add_key() call.
Remediation
Install update from vendor's website.