Linux Kernel up to 6.9.9 sdhci blk_queue_max_segment_size memory corruption

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.9.9. This affects the function blk_queue_max_segment_size of the component sdhci. Executing a manipulation can lead to memory corruption. This vulnerability is registered as CVE-2024-42242. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.9.9. This vulnerability affects the function blk_queue_max_segment_size of the component sdhci. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE blk_queue_max_segment_size() ensured: if (max_size < PAGE_SIZE) max_size = PAGE_SIZE; whereas: blk_validate_limits() makes it an error: if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE)) return -EINVAL; The change from one to the other, exposed sdhci which was setting maximum segment size too low in some circumstances. Fix the maximum segment size when it is too low.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2024-42242 since 07/30/2024. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/09/2024).

Upgrading to version 6.9.10 eliminates this vulnerability. Applying the patch bf78b1accef4/63d20a94f24f 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

• 6.9.0
• 6.9.1
• 6.9.2
• 6.9.3
• 6.9.4
• 6.9.5
• 6.9.6
• 6.9.7
• 6.9.8
• 6.9.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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