PT-2026-40031 · Unknown · Pam Authnft

Published 2026-05-12 · Updated 2026-05-13 · CVE-2026-43916

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions pam authnft versions prior to 0.2.0-alpha

Description pam authnft is a PAM session module that binds nftables firewall rules to authenticated sessions using cgroupv2 inodes. A heap buffer over-read exists in the peer lookup tcp() function. This occurs when a specially crafted NETLINK SOCK DIAG reply bypasses the message-size check, leading to a dereference beyond the end of the memory allocation.

Recommendations Update to version 0.2.0-alpha.

Fix

Out of bounds Read

Integer Underflow

Weakness Enumeration

CWE-125

CWE-191

Related Identifiers

CVE-2026-43916

Affected Products

Pam Authnft

References · 7

• https://cve.org/CVERecord?id=CVE-2026-43916 · Security Note
• https://ubuntu.com/security/CVE-2026-43916 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43916 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43916 · Security Note
• https://github.com/identd-ng/pam_authnft/pull/10 · Note
• https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh · Note
• https://t.me/CVEtracker/53512 · Telegram Post