PT-2025-39124 · Linux · Linux Kernel

Published 2025-08-11 · Updated 2025-09-23 · CVE-2025-39867

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

AV:L/AC:L/Au:S/C:N/I:N/A:C

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

Description A flaw exists in the Linux kernel’s netfilter module, specifically within the nft set pipapo function. A commit introduced a null dereference issue when handling empty sets, breaking the check for a null scratch map. The incorrect check if (unlikely(!raw cpu ptr(m->scratch))) should have been if (!*raw cpu ptr(m->scratch)). This issue is only reproducible when AVX2 support is unavailable. The m variable and scratch pointer are involved in the error.

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

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2025-13889

CVE-2025-39867

Affected Products

Linux Kernel

References · 17

• https://security-tracker.debian.org/tracker/CVE-2025-39867 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2025-25754.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39867 · Security Note
• https://ubuntu.com/security/CVE-2025-39867 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39867 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39867 · Security Note
• https://bdu.fstec.ru/vul/2025-13889 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39867 · Vendor Advisory
• https://git.kernel.org/linus/30c1d25b9870d551be42535067d5481668b5e6f3 · Note
• https://vuldb.com/?id.325580 · Note
• https://cybersecurity-help.cz/vdb/SB2025092379 · Note
• https://git.kernel.org/stable/c/30c1d25b9870d551be42535067d5481668b5e6f3 · Note
• https://lore.kernel.org/linux-cve-announce/2025092357-CVE-2025-39867-51e2@gregkh · Note
• https://twitter.com/CVEnew/status/1970393445295366410 · Twitter Post
• https://t.me/cveNotify/136109 · Telegram Post