CVE-2026-43092
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
xsk: validate MTU against usable frame size on bind
AF_XDP bind currently accepts zero-copy pool configurations without
verifying that the device MTU fits into the usable frame space provided
by the UMEM chunk.
This becomes a problem since we started to respect tailroom which is
subtracted from chunk_size (among with headroom). 2k chunk size might
not provide enough space for standard 1500 MTU, so let us catch such
settings at bind time. Furthermore, validate whether underlying HW will
be able to satisfy configured MTU wrt XSK's frame size multiplied by
supported Rx buffer chain length (that is exposed via
net_device::xdp_zc_max_segs).
https://git.kernel.org/stable/c/25e1e91a8da819924df0b16e3812d7b24c8ce133
https://git.kernel.org/stable/c/36ee60b569ba0dfb6f961333b90d19ab5b323fa9
https://git.kernel.org/stable/c/a55793e5a97d4e39bdb380873a9780fe0010bff6
https://git.kernel.org/stable/c/b2f4daa6422fd6cc0cec969794dab4a88ea4cea1
https://git.kernel.org/stable/c/f669d60db11dbabb96279f2b20f9d1cba43cddb2