Vulnerability CVE-2024-27431
Published: 2024-05-17

Description:
In the Linux kernel, the following vulnerability has been resolved:

cpumap: Zero-initialise xdp_rxq_info struct before running XDP program

When running an XDP program that is attached to a cpumap entry, we don't
initialise the xdp_rxq_info data structure being used in the xdp_buff
that backs the XDP program invocation. Tobias noticed that this leads to
random values being returned as the xdp_md->rx_queue_index value for XDP
programs running in a cpumap.

This means we're basically returning the contents of the uninitialised
memory, which is bad. Fix this by zero-initialising the rxq data
structure before running the XDP program.

 References:
https://git.kernel.org/stable/c/5f4e51abfbe6eb444fa91906a5cd083044278297
https://git.kernel.org/stable/c/f0363af9619c77730764f10360e36c6445c12f7b
https://git.kernel.org/stable/c/3420b3ff1ff489c177ea1cb7bd9fbbc4e9a0be95
https://git.kernel.org/stable/c/f562e4c4aab00986dde3093c4be919c3f2b85a4a
https://git.kernel.org/stable/c/eaa7cb836659ced2d9f814ac32aa3ec193803ed6
https://git.kernel.org/stable/c/2487007aa3b9fafbd2cb14068f49791ce1d7ede5
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