CVE-2026-43916

pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker

State: Published
Severity: 8.7 High
Published: May 12, 2026
Updated: May 13, 2026
Reserved: May 4, 2026

Description

pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-125 Out-of-bounds Read
CWE-191 Integer Underflow (Wrap or Wraparound)

Affected Products

Product	Versions
pam_authnftidentd-ng	< 0.2.0-alphaAffected

References

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