SB2026050992 - Type Confusion in Linux kernel bpf
Published: May 9, 2026
Security Bulletin ID
SB2026050992
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) Type Confusion (CVE-ID: CVE-2026-43306)
CWE-ID: CWE-843 - Type confusion
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper function type handling in the BPF crypto destructor kfunc registration when invoking the destructor through an indirect function call with CONFIG_CFI enabled. A local user can trigger BPF operations that free crypto context fields to cause a denial of service.
Exploitation requires CONFIG_CFI to be enabled.
Remediation
Install update from vendor's website.