Linux Kernel up to 6.18.15/6.19.5 net set_rps_cpu out-of-bounds

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.18.15/6.19.5. The affected element is the function set_rps_cpu of the component net. This manipulation causes out-of-bounds. This vulnerability is handled as CVE-2026-43208. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.15/6.19.5. It has been declared as problematic. Affected by this vulnerability is the function set_rps_cpu of the component net. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: do not pass flow_id to set_rps_cpu() Blamed commit made the assumption that the RPS table for each receive queue would have the same size, and that it would not change. Compute flow_id in set_rps_cpu(), do not assume we can use the value computed by get_rps_cpu(). Otherwise we risk out-of-bound access and/or crashes.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-43208 since 05/01/2026. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch 5455a232edea6b946b99449f15ca771a8874a5a6/ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c/8a8a9fac9efa6423fd74938b940cb7d731780718 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
• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3
• 6.19.4
• 6.19.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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