xfrm_user: fix info leak in build_mapping()

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Summary

CVECVE-2026-43089
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:22 UTC
Updated2026-06-01 17:17:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000130000 probability, percentile 0.022920000 (date 2026-05-28)

Problem Types: CWE-401

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 521385cbd50ca9474396d88462fcdfa6489685d9 git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 d3125c541a96fb3c0fc7210112684baf22b6c24d git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 5a1a4b049ddde41466ccac0daeec326254b133f2 git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 700c9622b23c33b5933e6dcea816492c064e4e10 git Not specified
CNA Linux Linux affected 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 1beb76b2053b68c491b78370794b8ff63c8f8c02 git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* 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/c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/521385cbd50ca9474396d88462fcdfa6489685d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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