CVE-2025-24031

MEDIUM
2025-02-10 [email protected]
5.1
CVSS 4.0
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CVSS Vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L/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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch Released
Apr 05, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 18:25 vuln.today
CVE Published
Feb 10, 2025 - 16:15 nvd
MEDIUM 5.1

Tags

Null Pointer Dereference Denial Of Service Redhat Suse

Description

PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the pam_pkcs11 module segfaults when a user presses ctrl-c/ctrl-d when they are asked for a PIN. When a user enters no PIN at all, `pam_get_pwd` will never initialize the password buffer pointer and as such `cleanse` will try to dereference an uninitialized pointer. On my system this pointer happens to have the value 3 most of the time when running sudo and as such it will segfault. The most likely impact to a system affected by this issue is an availability impact due to a daemon that uses PAM crashing. As of time of publication, a patch for the issue is unavailable.

Analysis

PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. Rated medium severity (CVSS 5.1), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified as NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the pam_pkcs11 module segfaults when a user presses ctrl-c/ctrl-d when they are asked for a PIN. When a user enters no PIN at all, `pam_get_pwd` will never initialize the password buffer pointer and as such `cleanse` will try to dereference an uninitialized pointer. On my system this pointer happens to have the value 3 most of the time when running sudo and as such it will segfault. The most likely impact to a system affected by this issue is an availability impact due to a daemon that uses PAM crashing. As of time of publication, a patch for the issue is unavailable.

Affected Products

See vendor advisory for affected versions.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +26
POC: 0

Vendor Status

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CVE-2025-24031 vulnerability details – vuln.today
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