CVE-2026-43916 Details
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.
A heap buffer over-read vulnerability has been identified in the pam_authnft PAM session module, prior to version 0.2.0-alpha. The issue arises in the peer_lookup_tcp function, where a crafted NETLINK_SOCK_DIAG reply can bypass the message-size validation. This allows for a dereference beyond the allocated buffer, potentially leading to memory corruption.
Users are advised to upgrade to pam_authnft version 0.2.0-alpha or later. As a temporary workaround, do not configure rhost_policy=kernel; the default rhost_policy=pam does not exercise the netlink path.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 12, 2026CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/identd-ng/pam_authnft/pull/10 | [email protected] | Source CodeVendor |
| https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
| CWE-191 | Integer Underflow (Wrap or Wraparound) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| identd-ng pam_authnft | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | New CVE Received | [email protected] |