CVE-2024-38570
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.68% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0636b34b44589b142700ac137b5f69802cfe2e37Patch
- https://git.kernel.org/stable/c/501cd8fabf621d10bd4893e37f6ce6c20523c8caPatch
- https://git.kernel.org/stable/c/d98779e687726d8f8860f1c54b5687eec5f63a73Patch
- https://git.kernel.org/stable/c/e42e8a24d7f02d28763d16ca7ec5fc6d1f142af0Patch
- https://git.kernel.org/stable/c/0636b34b44589b142700ac137b5f69802cfe2e37Patch
- https://git.kernel.org/stable/c/501cd8fabf621d10bd4893e37f6ce6c20523c8caPatch
- https://git.kernel.org/stable/c/d98779e687726d8f8860f1c54b5687eec5f63a73Patch
- https://git.kernel.org/stable/c/e42e8a24d7f02d28763d16ca7ec5fc6d1f142af0Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.