CVE-2021-47334
Linux kernel Vendor Use After Free
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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
May 21, 2024, 4:54 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2021-47334
.
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CVE-2021-47334
vulnerability anywhere in the article.
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CVE-2021-47334
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47334
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47334
weaknesses.