CVE-2024-38570Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: gfs2: Fix potential glock use-after-free on unmount When a DLM lockspace is released and there ares still locks in that lockspace, DLM will unlock those locks automati…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
In the Linux kernel, the following vulnerability has been resolved:
gfs2: Fix potential glock use-after-free on unmount
When a DLM lockspace is released and there ares still locks in that lockspace, DLM will unlock those locks automatically. Commit fb6791d100d1b started exploiting this behavior to speed up filesystem unmount: gfs2 would simply free glocks it didn't want to unlock and then release the lockspace. This didn't take the bast callbacks for asynchronous lock contention notifications into account, which remain active until until a lock is unlocked or its lockspace is released.
To prevent those callbacks from accessing deallocated objects, put the glocks that should not be unlocked on the sd_dead_glocks list, release the lockspace, and only then free those glocks.
As an additional measure, ignore unexpected ast and bast callbacks if the receiving glock is dead.
Linux >= fb6791d100d1bba20b5cdbc4912e1f7086ec60f8 < 94b32a85d1a76ae4f1b42a88677fa20b20187729Linux >= fb6791d100d1bba20b5cdbc4912e1f7086ec60f8 < 0636b34b44589b142700ac137b5f69802cfe2e37Linux >= fb6791d100d1bba20b5cdbc4912e1f7086ec60f8 < e42e8a24d7f02d28763d16ca7ec5fc6d1f142af0Linux >= fb6791d100d1bba20b5cdbc4912e1f7086ec60f8 < 501cd8fabf621d10bd4893e37f6ce6c20523c8caLinux >= fb6791d100d1bba20b5cdbc4912e1f7086ec60f8 < d98779e687726d8f8860f1c54b5687eec5f63a73Linux 3.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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