Login-process hang via FIFO path substitution
Published Feb 6, 2024 · Updated May 12, 2026
Denial of service in Linux-PAM on Siemens RUGGEDCOM ROX before V2.17.1 allows local users to block affected login processes. In pam_namespace, protect_dir() opens a user-controlled path without O_DIRECTORY, so a substituted FIFO makes openat() wait indefinitely. The target must use a polyinstantiated directory beneath a user-controlled location; planting the FIFO causes a later login for that user to hang.
Summary
What happened
Denial of service in Linux-PAM on Siemens RUGGEDCOM ROX before V2.17.1 allows local users to block affected login processes. In pam_namespace, protect_dir() opens a user-controlled path without O_DIRECTORY, so a substituted FIFO makes openat() wait indefinitely. The target must use a polyinstantiated directory beneath a user-controlled location; planting the FIFO causes a later login for that user to hang.
The record
- CVE
- CVE-2024-22365
- Published
- Feb 6, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- RUGGEDCOM ROX RX1500
- Classifications
- CWE-664, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 6, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <V2.17.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- pam_namespace FIFO denial-of-service reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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