CVE-2026-43916

HIGH

pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/identd-ng/pam_authnft/pull/10

Scores

CVSS v4 8.7
EPSS 0.0026
EPSS Percentile 17.4%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-125 CWE-191
Status published
Products (1)
identd-ng/pam_authnft < 0.2.0-alpha
Published May 12, 2026
Tracked Since May 12, 2026