CVE - CVE-2021-46904

CVE-ID
CVE-2021-46904	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/145c89c441d27696961752bf51b323f347601bee URL:https://git.kernel.org/stable/c/145c89c441d27696961752bf51b323f347601bee MISC:https://git.kernel.org/stable/c/388d05f70f1ee0cac4a2068fd295072f1a44152a URL:https://git.kernel.org/stable/c/388d05f70f1ee0cac4a2068fd295072f1a44152a MISC:https://git.kernel.org/stable/c/4a2933c88399c0ebc738db39bbce3ae89786d723 URL:https://git.kernel.org/stable/c/4a2933c88399c0ebc738db39bbce3ae89786d723 MISC:https://git.kernel.org/stable/c/8a12f8836145ffe37e9c8733dce18c22fb668b66 URL:https://git.kernel.org/stable/c/8a12f8836145ffe37e9c8733dce18c22fb668b66 MISC:https://git.kernel.org/stable/c/92028d7a31e55d53e41cff679156b9432cffcb36 URL:https://git.kernel.org/stable/c/92028d7a31e55d53e41cff679156b9432cffcb36 MISC:https://git.kernel.org/stable/c/a462067d7c8e6953a733bf5ade8db947b1bb5449 URL:https://git.kernel.org/stable/c/a462067d7c8e6953a733bf5ade8db947b1bb5449 MISC:https://git.kernel.org/stable/c/caf5ac93b3b5d5fac032fc11fbea680e115421b4 URL:https://git.kernel.org/stable/c/caf5ac93b3b5d5fac032fc11fbea680e115421b4 MISC:https://git.kernel.org/stable/c/dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac URL:https://git.kernel.org/stable/c/dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac
Assigning CNA
kernel.org
Date Record Created
20240225	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240225)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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