CVE-2026-43092

Summary

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).

Affected Software

VendorProductVersion RangeStatus
LinuxLinux24ea50127ecf0efe819c1f6230add27abc6ca9d9 < a55793e5a97d4e39bdb380873a9780fe0010bff6affected
LinuxLinux24ea50127ecf0efe819c1f6230add27abc6ca9d9 < f669d60db11dbabb96279f2b20f9d1cba43cddb2affected
LinuxLinux24ea50127ecf0efe819c1f6230add27abc6ca9d9 < 25e1e91a8da819924df0b16e3812d7b24c8ce133affected
LinuxLinux24ea50127ecf0efe819c1f6230add27abc6ca9d9 < b2f4daa6422fd6cc0cec969794dab4a88ea4cea1affected
LinuxLinux24ea50127ecf0efe819c1f6230add27abc6ca9d9 < 36ee60b569ba0dfb6f961333b90d19ab5b323fa9affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.136 <= 6.6.*unaffected
LinuxLinux6.12.83 <= 6.12.*unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References