System hang via self-linked exFAT cluster
Published Jan 21, 2025 · Updated May 12, 2026
Improper loop termination in the Linux kernel exFAT driver allows local users to hang filesystem tasks through a corrupted volume. In exfat_readdir(), a self-linked cluster containing an unused directory entry leaves dentry unchanged, so traversal never exits and s_lock remains held. Exploitation requires local access to use the malformed exFAT filesystem; the retained lock stalls other operations such as exfat_sync_fs().
Summary
What happened
Improper loop termination in the Linux kernel exFAT driver allows local users to hang filesystem tasks through a corrupted volume. In exfat_readdir(), a self-linked cluster containing an unused directory entry leaves dentry unchanged, so traversal never exits and s_lock remains held. Exploitation requires local access to use the malformed exFAT filesystem; the retained lock stalls other operations such as exfat_sync_fs().
The record
- CVE
- CVE-2024-57940
- Published
- Jan 21, 2025
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-835, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 21, 2025CVE 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <*
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo