PT-2026-37402 · Linux · Linux

Published 2026-05-06 · Updated 2026-05-06 · CVE-2026-43092

NVD

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).

Related Identifiers

CVE-2026-43092

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-43092 · Security Note
• https://git.kernel.org/stable/c/a55793e5a97d4e39bdb380873a9780fe0010bff6 · Note
• https://git.kernel.org/stable/c/25e1e91a8da819924df0b16e3812d7b24c8ce133 · Note
• https://git.kernel.org/stable/c/b2f4daa6422fd6cc0cec969794dab4a88ea4cea1 · Note
• https://git.kernel.org/stable/c/36ee60b569ba0dfb6f961333b90d19ab5b323fa9 · Note
• https://git.kernel.org/stable/c/f669d60db11dbabb96279f2b20f9d1cba43cddb2 · Note