CVE-2026-43093

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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 2% of CVEs (scores of 2026-10-25)

CWE

CWE-787

Published

2026-05-06

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1
• https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67
• https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384
• https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39
• https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104

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