CVE-2021-47334 Affecting kernel-rt-kvm package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTKVM-7004083
- published 22 May 2024
- disclosed 21 May 2024
How to fix?
There is no fixed version for Centos:7 kernel-rt-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2021-47334
- https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069
- https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a
- https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d
- https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e
- https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab
- https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae
- https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274
- https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3
- https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c