SB20260918366 - Type Confusion in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB20260918366
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) Type Confusion (CVE-ID: CVE-2026-90312)
CWE-ID: CWE-843 - Type confusion
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to access underlying kernel object data.
The vulnerability exists due to type confusion in the BPF verifier's check_atomic_load() function when verifying a load-acquire operation that fetches into its own source register. A local user can load a crafted BPF program to access underlying kernel object data.
Remediation
Install update from vendor's website.