CVE-2021-46905 - CVE House
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Status published Medium CVE-2021-46905

net: hso: fix NULL-deref on disconnect regression

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
a462067d7c8e6953a733bf5ade8db947b1bb5449, 145c89c441d27696961752bf51b323f347601bee, caf5ac93b3b5d5fac032fc11fbea680e115421b4, 92028d7a31e55d53e41cff679156b9432cffcb36, 4a2933c88399c0ebc738db39bbce3ae89786d723, dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac, 388d05f70f1ee0cac4a2068fd295072f1a44152a, 8a12f8836145ffe37e9c8733dce18c22fb668b66, 4.19.187, 5.4.112, 5.10.30, 5.11.14, 5.12, 0, 4.19.189, 5.4.115, 5.10.33, 5.11.17, 5.12.1, 5.13

Timeline

Official Publish: February 25th, 2024
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.