SB2026091886 - Numeric Truncation Error in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB2026091886
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Numeric Truncation Error (CVE-ID: CVE-2026-93125)
CWE-ID: CWE-197 - Numeric Truncation Error
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass BPF verifier memory-access checks.
The vulnerability exists due to numeric truncation in the BPF verifier's check_kfunc_args() function when processing rdonly_buf_size or rdwr_buf_size kfunc arguments larger than U32_MAX. A local user can load a BPF program that supplies an oversized buffer-size argument to bypass BPF verifier memory-access checks.
Remediation
Install update from vendor's website.