SB20260928162 - Type Confusion in Linux kernel bpf
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928162
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Type Confusion (CVE-ID: CVE-2026-98039)
CWE-ID: CWE-843 - Type confusion
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to perform arbitrary kernel read and write operations.
The vulnerability exists due to improper type validation in map_kptr_match_type() when storing a non-per-CPU pointer in a BPF_KPTR_PERCPU map field. A local user can load a crafted BPF program that stores a plain allocation or referenced kernel pointer in the field to perform arbitrary kernel read and write operations.
Remediation
Install update from vendor's website.