CVE-2021-47334
In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev().
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). 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: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.
- 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
- 0.28% probability · 20th 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/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Patch
- https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aPatch
- https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dPatch
- https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720ePatch
- https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabPatch
- https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aePatch
- https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Patch
- https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Patch
- https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cPatch
- https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Patch
- https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aPatch
- https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dPatch
- https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720ePatch
- https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabPatch
- https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aePatch
- https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Patch
- https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Patch
- https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.