CVE-2025-21808

Summary

In the Linux kernel, the following vulnerability has been resolved: net: xdp: Disallow attaching device-bound programs in generic mode Device-bound programs are used to support RX metadata kfuncs. These kfuncs are driver-specific and rely on the driver context to read the metadata. This means they can't work in generic XDP mode. However, there is no check to disallow such programs from being attached in generic mode, in which case the metadata kfuncs will be called in an invalid context, leading to crashes. Fix this by adding a check to disallow attaching device-bound programs in generic mode.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/3595599fa8360bb3c7afa7ee50c810b4a64106ea ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/3595599fa8360bb3c7afa7ee50c810b4a64106eaPatch
• https://git.kernel.org/stable/c/557707906dd3e34b8a8c265f664d19f95799937ePatch
• https://git.kernel.org/stable/c/5a9eae683d6c36e8a7aa31e5eb8b369e41aa66e1Patch
• https://git.kernel.org/stable/c/b1bc4a35a04cbeb85b6ef5911ec015baa424989fPatch