Linux Kernel up to 6.10.7/6.11-rc1 vmwgfx buffer overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.10.7/6.11-rc1. This affects an unknown part of the component vmwgfx. This manipulation causes buffer overflow. This vulnerability is handled as CVE-2024-46712. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.10.7/6.11-rc1 and classified as critical. Affected by this vulnerability is an unknown functionality of the component vmwgfx. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Disable coherent dumb buffers without 3d Coherent surfaces make only sense if the host renders to them using accelerated apis. Without 3d the entire content of dumb buffers stays in the guest making all of the extra work they're doing to synchronize between guest and host useless. Configurations without 3d also tend to run with very low graphics memory limits. The pinned console fb, mob cursors and graphical login manager tend to run out of 16MB graphics memory that those guests use. Fix it by making sure the coherent dumb buffers are only used on configs with 3d enabled.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2024-46712 since 09/11/2024. The exploitation appears to be easy. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/20/2024).

Upgrading to version 6.10.8 or 6.11-rc2 eliminates this vulnerability. Applying the patch c45558414b8f/e9fd436bb8fb 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

• 6.10.0
• 6.10.1
• 6.10.2
• 6.10.3
• 6.10.4
• 6.10.5
• 6.10.6
• 6.10.7
• 6.11-rc1

License

• open-source

Website

• Vendor: https://www.kernel.org/

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