xfrm_user: fix info leak in build_report()

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Summary

CVECVE-2026-31671
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:46 UTC
Updated2026-07-14 13:18:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_report() struct xfrm_user_report is a __u8 proto field followed by a struct xfrm_selector which means there is three "empty" bytes of padding, but the padding is never zeroed before copying to userspace. Fix that up by zeroing the structure before setting individual member 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: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

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 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 d27c02eec529f78055a46a5c9e6c62684382b2d8 git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 716c546e88cfe49d841658240e10cb57bc50a2cc git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9 git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 e0c8542c3d097ed4205ded51868195d5d6ddac62 git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 ff5ee507302303b15859753c3e0d67d38fd12c88 git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 6c55714c931051cd7f4839c19ce0867179fd22fe git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72 git Not specified
CNA Linux Linux affected 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 d10119968d0e1f2b669604baf2a8b5fdb72fa6b4 git Not specified
CNA Linux Linux affected 2.6.19 Not specified
CNA Linux Linux unaffected 2.6.19 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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