Linux Kernel up to 5.12.0 hso hso_serial_tty_unregister null pointer dereference

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.12.0 and classified as critical. This issue affects the function hso_serial_tty_unregister of the component hso. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2021-46905. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.12.0 (Operating System). Affected by this issue is the function hso_serial_tty_unregister of the component hso. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

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().

The weakness was published 02/25/2024. The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2021-46905 since 02/25/2024. There are known technical details, but no exploit is available.

Upgrading to version 4.19.189, 5.4.115, 5.10.33, 5.11.17, 5.12.1 or 5.13 eliminates this vulnerability. Applying the patch 5c17cfe155d2/d7fad2ce15bd/90642ee9eb58/0f000005da31/41c44e1f3112/2ad5692db728 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.19.188
• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.4.114
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12
• 5.10.13
• 5.10.14
• 5.10.15
• 5.10.16
• 5.10.17
• 5.10.18
• 5.10.19
• 5.10.20
• 5.10.21
• 5.10.22
• 5.10.23
• 5.10.24
• 5.10.25
• 5.10.26
• 5.10.27
• 5.10.28
• 5.10.29
• 5.10.30
• 5.10.31
• 5.10.32
• 5.11
• 5.11.0
• 5.11.1
• 5.11.2
• 5.11.3
• 5.11.4
• 5.11.5
• 5.11.6
• 5.11.7
• 5.11.8
• 5.11.9
• 5.11.10
• 5.11.11
• 5.11.12
• 5.11.13
• 5.11.14
• 5.11.15
• 5.11.16
• 5.12
• 5.12.0

License

• open-source

Website

• Vendor: https://www.kernel.org/

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