CVE-2026-43093

Description

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.

References

• https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1
• https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39
• https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12
• https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f
• https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931