// For flags

CVE-2024-22365

pam: allowing unprivileged user to block another user namespace

Severity Score

6.4
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

linux-pam (aka Linux PAM) before 1.6.0 allows attackers to cause a denial of service (blocked login process) via mkfifo because the openat call (for protect_dir) lacks O_DIRECTORY.

linux-pam (también conocido como Linux PAM) anterior a 1.6.0 permite a los atacantes provocar una denegación de servicio (proceso de inicio de sesión bloqueado) a través de mkfifo porque la llamada openat (para protect_dir) carece de O_DIRECTORY.

A vulnerability was found in Linux PAM. An unprivileged user that is not yet in a corresponding mount namespace with ~/tmp mounted as a polyinstantiated dir can place a FIFO there, and a subsequent attempt to login as this user with `pam_namespace` configured will cause the `openat()` in `protect_dir()` to block the attempt, causing a local denial of service.

USN-6588-1 fixed a vulnerability in PAM. This update provides the corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. Matthias Gerstner discovered that the PAM pam_namespace module incorrectly handled special files when performing directory checks. A local attacker could possibly use this issue to cause PAM to stop responding, resulting in a denial of service.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
None
High
Integrity
None
High
Availability
Low
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-01-09 CVE Reserved
  • 2024-01-18 CVE Published
  • 2025-04-15 EPSS Updated
  • 2025-06-05 CVE Updated
  • 2025-06-05 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-277: Insecure Inherited Permissions
  • CWE-664: Improper Control of a Resource Through its Lifetime
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux-pam
Search vendor "Linux-pam"
 Linux-pam
Search vendor "Linux-pam" for product "Linux-pam"
 < 1.6.0
Search vendor "Linux-pam" for product "Linux-pam" and version " < 1.6.0"
-
Affected