CVE-2025-39990

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in the BPF (Berkeley Packet Filter) subsystem related to helper function validation within the get helper proto function. A kernel test robot identified a verifier bug where the helper function pointer could become NULL due to a disabled configuration option. The tail call helper function is marked with BPF PTR POISON as it is intentionally unused.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.