PT-2025-42264 · Linux+1 · Linux Kernel+1

Published 2025-10-15 · Updated 2026-05-26 · CVE-2025-39990

Positive Technologies (AI Summary)

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.

Exploit

Related Identifiers

AZL-68519

CVE-2025-39990

ECHO-E340-3D7B-F09C

OPENSUSE-SU-2025:20172-1

SUSE-SU-2026:20012-1

SUSE-SU-2026:20015-1

SUSE-SU-2026:20021-1

Affected Products

Debian

Linux Kernel

References · 249

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39990.json · Exploit
• https://osv.dev/vulnerability/CVE-2025-39990 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-39990 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:20172-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2025-39990 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20012-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2025-39990 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39990 · Security Note
• https://osv.dev/vulnerability/AZL-68519 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2025-39990 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39990 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2025-39990 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20015-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2025-39990 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39990 · Vendor Advisory