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

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Summary

CVECVE-2026-43093
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:22 UTC
Updated2026-05-08 13:16:38 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000120000 probability, percentile 0.017410000 (date 2026-05-11)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 a03975beb9f6af0d8ac051e30b2abeabe618414f git Not specified
CNA Linux Linux affected 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 0ec4d3f6e6934deb843b561ae048cd17218e5ad1 git Not specified
CNA Linux Linux affected 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12 git Not specified
CNA Linux Linux affected 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 6523bc1b40e69301f24c14338b762af4739d6d39 git Not specified
CNA Linux Linux affected 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 a315e022a72d95ef5f1d4e58e903cb492b0ad931 git Not specified
CNA Linux Linux affected ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee git Not specified
CNA Linux Linux affected 25c9cdef57488578da21d99eb614b97ffcf6e59f git Not specified
CNA Linux Linux affected 98d3c852e63b49129515dd18c875999efaf8530a git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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