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CVE-2024-38570 is a use-after-free vulnerability in the Linux kernel's GFS2 filesystem during unmount. An unmount optimization frees certain glock objects before releasing their Distributed Lock Manager (DLM) lockspace, relying on DLM to unlock remaining locks automatically. However, asynchronous lock-contention notification callbacks (bast callbacks) remain active until the associated lock is unlocked or the lockspace is released. These callbacks can consequently access already-deallocated glocks. The fix delays glock deallocation until after lockspace release and ignores unexpected ast and bast callbacks targeting dead glocks.
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A use-after-free vulnerability in the Linux kernel's GFS2 filesystem during unmount. Glock objects can be freed while asynchronous DLM callbacks remain active, allowing callbacks to access deallocated memory. The fix delays freeing these objects until the lockspace is released and ignores unexpected callbacks for dead glocks. The advisory assigns a CVSS v3 score of 7.8, with local access and low privileges required.
Potential use-after-free vulnerability involving GFS2 glocks during filesystem unmount.
Linux kernel GFS2 glock use-after-free during filesystem unmount.
Potential Linux kernel GFS2 glock use-after-free during filesystem unmount.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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