Linux Kernel up to 6.18.29/7.0.6/7.1-rc2 platform cros_typec_register_thunderbolt null pointer dereference

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 6.18.29/7.0.6/7.1-rc2. The impacted element is the function cros_typec_register_thunderbolt of the component Platform. Executing a manipulation can lead to null pointer dereference. This vulnerability is registered as CVE-2026-46134. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.18.29/7.0.6/7.1-rc2. This vulnerability affects the function cros_typec_register_thunderbolt of the component platform. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: platform/chrome: cros_ec_typec: Init mutex in Thunderbolt registration cros_typec_register_thunderbolt() missed initializing the `adata->lock` mutex. This leads to a NULL dereference when the mutex is later acquired (e.g. in cros_typec_altmode_work()). Initialize the mutex in cros_typec_register_thunderbolt() to fix the issue.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-46134 since 05/13/2026. Technical details are known, but there is no available exploit.

Upgrading to version 6.18.30, 7.0.7 or 7.1-rc3 eliminates this vulnerability. Applying the patch 23ae72e8c2f1c1d1da8cbd479320ddcfcc9c7435/3b13d5883a097f538fccbab1c61c95546d29621f/525cb7ba6661074c1c5cc3772bccc6afab6791ef 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

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.1-rc1
• 7.1-rc2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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