SB20260827123 - Out-of-bounds read in Linux kernel riscv lib
Published: August 27, 2026
Security Bulletin ID
SB20260827123
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-74751)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the riscv ZBB-optimized strnlen implementation when processing memory ranges whose end falls on a page boundary. A remote attacker can trigger the vulnerable code path to cause a denial of service.
The issue occurs when the requested count ends exactly at an aligned boundary and the following page is unmapped.
Remediation
Install update from vendor's website.