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CVE-2026-43093

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.20, 5.5, 5.7, 5.10.258, 5.15.209, and 5 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in 5f123bc278bf4e3283d8606321bebbfd299f4384; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in 1a6051cd7e3e4c54ff3854a43b638b9292af5e67; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in 8769708add9eadeea8041a9761771bb715a87104; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in a03975beb9f6af0d8ac051e30b2abeabe618414f; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in 0ec4d3f6e6934deb843b561ae048cd17218e5ad1; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in 9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in 6523bc1b40e69301f24c14338b762af4739d6d39; From 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 · fixed in a315e022a72d95ef5f1d4e58e903cb492b0ad931; From 4.19.118 · fixed in 4.20; From 5.4.35 · fixed in 5.5; From 5.6.7 · fixed in 5.7

  • Linux Linux

    5.7

  • KernelLinux

    From 5.7.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.136; From 6.7.0 · fixed in 6.12.83; From 6.13.0 · fixed in 6.18.24; From 6.19.0 · fixed in 6.19.14

References 8

git.kernel.org