Kernel crash via GFS2 unmount race
Published Jul 29, 2024 · Updated Sep 8, 2026
NULL pointer dereference in Linux GFS2 5.12 and later allows local users to crash the kernel by racing glock work with an unmount. gfs2_jindex_free clears sd_jdesc outside the log-flush lock while outstanding glock work can reach gfs2_log_flush and dereference that pointer. Exploitation requires local access, a mounted GFS2 file system, and control over the unmount race; the resulting kernel fault interrupts the system.
Summary
What happened
NULL pointer dereference in Linux GFS2 5.12 and later allows local users to crash the kernel by racing glock work with an unmount. gfs2_jindex_free clears sd_jdesc outside the log-flush lock while outstanding glock work can reach gfs2_log_flush and dereference that pointer. Exploitation requires local access, a mounted GFS2 file system, and control over the unmount race; the resulting kernel fault interrupts the system.
The record
- CVE
- CVE-2024-42079
- Published
- Jul 29, 2024
- Updated
- Sep 8, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-476, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 29, 2024CVE publishedPublication date reported by the CVE source.
- Sep 8, 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?
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- Affected versionversion=V3.1.6 <*
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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