Type Confusion in Linux kernel - CVE-2026-98039
Published: September 28, 2026
Vulnerability identifier: #VU152439
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-98039
CWE-ID: CWE-843
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-98039
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3