SB20260720432 - Out-of-bounds read in Linux kernel renesas rcar
Published: July 20, 2026
Security Bulletin ID
SB20260720432
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-63838)
CWE-ID: CWE-125 - Out-of-bounds read
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 read in the component_dais[] array handling in the rsnd probe logic when processing component_dais[] entries. A local user can trigger the vulnerable code path to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/134c61925e9e9ee0f4fdbab5c3984d5bb024f5f5
- https://git.kernel.org/stable/c/15e7b2ac2455995a6af02b9d3da7a432837aaf72
- https://git.kernel.org/stable/c/9f1daac27ca28e98c8c0e4450de42bb68d547250
- https://git.kernel.org/stable/c/a62b3e6e42359a79158c134e3cf5c74fe160c3f5
- https://git.kernel.org/stable/c/f9e437cddf6cf9e603bdaefe148c1f4792aaf39c