PT-2026-37403 · Linux · Linux

Published 2026-05-06 · Updated 2026-05-06 · CVE-2026-43093

NVD

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

xsk: tighten UMEM headroom validation to account for tailroom and min frame

The current headroom validation in xdp umem reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb shared info stored at the end of XSK frame would be corrupted.

HW typically works with 128-aligned sizes so let us provide this value as bare minimum.

Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.

Related Identifiers

CVE-2026-43093

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-43093 · Security Note
• https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931 · Note
• https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f · Note
• https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12 · Note
• https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39 · Note
• https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1 · Note