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CVE-2021-47334

Disclosure Date: May 21, 2024 •
CVE-2021-47334
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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.

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CVSS V3 Severity and Metrics
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None
Impact Score:
Unknown
Exploitability Score:
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Vector:
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Attack Vector (AV):
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Privileges Required (PR):
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Confidentiality (C):
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux 1512e7dc5eb0
Linux not down converted
Prerequisites
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Discovered By
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PoC Author
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Metasploit Module
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Reporter
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Vendors

  • Linux

Products

  • Linux
Technical Analysis