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CVE-2021-46904 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/145c89c441d27696961752bf51b323f347601bee Patch 
https://git.kernel.org/stable/c/388d05f70f1ee0cac4a2068fd295072f1a44152a Patch 
https://git.kernel.org/stable/c/4a2933c88399c0ebc738db39bbce3ae89786d723 Patch 
https://git.kernel.org/stable/c/8a12f8836145ffe37e9c8733dce18c22fb668b66 Patch 
https://git.kernel.org/stable/c/92028d7a31e55d53e41cff679156b9432cffcb36 Patch 
https://git.kernel.org/stable/c/a462067d7c8e6953a733bf5ade8db947b1bb5449 Patch 
https://git.kernel.org/stable/c/caf5ac93b3b5d5fac032fc11fbea680e115421b4 Patch 
https://git.kernel.org/stable/c/dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-46904
NVD Published Date:
02/26/2024
NVD Last Modified:
04/17/2024
Source:
kernel.org