Linux Kernel up to 6.6.21/6.7.9 mlx5e metadata_map null pointer dereference

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.6.21/6.7.9. Affected is the function metadata_map of the component mlx5e. Performing a manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2024-26858. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.21/6.7.9. It has been classified as critical. This affects the function metadata_map of the component mlx5e. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Use a memory barrier to enforce PTP WQ xmit submission tracking occurs after populating the metadata_map Just simply reordering the functions mlx5e_ptp_metadata_map_put and mlx5e_ptpsq_track_metadata in the mlx5e_txwqe_complete context is not good enough since both the compiler and CPU are free to reorder these two functions. If reordering does occur, the issue that was supposedly fixed by 7e3f3ba97e6c ("net/mlx5e: Track xmit submission to PTP WQ after populating metadata map") will be seen. This will lead to NULL pointer dereferences in mlx5e_ptpsq_mark_ts_cqes_undelivered in the NAPI polling context due to the tracking list being populated before the metadata map.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2024-26858 since 02/19/2024. Technical details are known, but no exploit is available.

Upgrading to version 6.6.22, 6.7.10 or 6.8 eliminates this vulnerability. Applying the patch d1f71615dbb3/936ef086161a/b7cf07586c40 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

• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.7.0
• 6.7.1
• 6.7.2
• 6.7.3
• 6.7.4
• 6.7.5
• 6.7.6
• 6.7.7
• 6.7.8
• 6.7.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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