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NOTICE UPDATED - April, 25th 2024

NIST has updated the NVD program announcement page with additional information regarding recent concerns and the temporary delays in enrichment efforts.

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.


Severity



CVSS 4.0 Severity and Metrics:

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


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

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

3 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