What is CVE-2025-39990?

CVE-2025-39990 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2025-10-15.

How severe is CVE-2025-39990?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Linux

CVE-2025-39990

In the Linux kernel, the following vulnerability has been resolved: bpf: Check the helper function is valid in get_helper_proto kernel test robot reported verifier bug [1] where the helper func pointer could be NULL due to disabled config option. As Alexei suggested we could check on that in get_helper_proto directly. Marking tail_call helper func with BPF_PTR_POISON, because it is unused by design. [1] https://lore.kernel.org/oe-lkp/202507160818.68358831-lkp@intel.com

EPSS: 0.001 (3.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions f470378c7562a2818b45ed11c98973f2b89eedd3, 5.8, 0

References

Frequently asked questions

What is CVE-2025-39990?: CVE-2025-39990 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2025-10-15.
How severe is CVE-2025-39990?: High severity. CVSS v3 base score is 7.8 out of 10.