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TI-2026-31979 Aliases CVE-2026-43916

pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker

Priority MEDIUM 43CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00263 18th percentileScored 2026-11-07
Fix Fixed pam_authnft (identd-ng): 0.2.0-alpha

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
identd-ngpam_authnftbefore 0.2.0-alpha0.2.0-alphaPatch availableCNA
  • pam_authnft Vendoridentd-ng Affected before 0.2.0-alpha Fixed in 0.2.0-alpha Patch available CNA

Remediation

  • Fix · CNA pam_authnft (identd-ng) Fixed in 0.2.0-alpha

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43916

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences