CVE-2023-53596
In the Linux kernel, the following vulnerability has been resolved: drivers: base: Free devm resources when unregistering a device In the current code, devres_release_all() only gets called if the device has a bus and has been probed.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.15%). 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: drivers: base: Free devm resources when unregistering a device In the current code, devres_release_all() only gets called if the device has a bus and has been probed. This leads to issues when using bus-less or driver-less devices where the device might never get freed if a managed resource holds a reference to the device. This is happening in the DRM framework for example. We should thus call devres_release_all() in the device_del() function to make sure that the device-managed actions are properly executed when the device is unregistered, even if it has neither a bus nor a driver. This is effectively the same change than commit 2f8d16a996da ("devres: release resources on device_del()") that got reverted by commit a525a3ddeaca ("driver core: free devres in device_release") over memory leaks concerns. This patch effectively combines the two commits mentioned above to release the resources both on device_del() and device_release() and get the best of both worlds.
- 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
- 0.15% probability · 5th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-415
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/297992e5c63528e603666e36081836204fc36ec9Patch
- https://git.kernel.org/stable/c/3bcc4c2a096e8342c8c719e595ce15de212694ddPatch
- https://git.kernel.org/stable/c/699fb50d99039a50e7494de644f96c889279aca3Patch
- https://git.kernel.org/stable/c/83e2ec36a92432e9445e853c12becbbae353b511Patch
- https://git.kernel.org/stable/c/b9ef4b0aa91d2f9f5951faafdbbd47cf01799ec3Patch
- https://git.kernel.org/stable/c/c8c426fae26086a0ca8ab6cc6da2de79810ec038Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.