net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak

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Summary

CVECVE-2026-43040
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:50 UTC
Updated2026-05-08 18:53:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak When processing Router Advertisements with user options the kernel builds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct has three padding fields that are never zeroed and can leak kernel data The fix is simple, just zeroes the padding fields.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-909

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 31910575a9de61e78065e93846e8e7a4894a18bf 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648 git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf 11d7fe97421cfc81549940c20ed5ac9472d6db05 git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf 7f56d87e527bb5a13c3e8b0d5840cb6332822f6d git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf 4f810c686fde509d1cdaa706322d9d2531f8f1a4 git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf b485eef3d97b7aae55ce669b6de555ec81f3d21c git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf ef3645606e4a635d5062a492f22b7f490852ee67 git Not specified
CNA Linux Linux affected 31910575a9de61e78065e93846e8e7a4894a18bf ae05340ccaa9d347fe85415609e075545bec589f git Not specified
CNA Linux Linux affected 2.6.24 Not specified
CNA Linux Linux unaffected 2.6.24 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 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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