net/ipv6: ioam6: prevent schema length wraparound in trace fill

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Summary

CVECVE-2026-43341
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 14:16:44 UTC
Updated2026-05-11 08:16:10 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer. Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000240000 probability, percentile 0.070400000 (date 2026-05-10)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8c6f6fa6772696be0c047a711858084b38763728 e96d48b37708d53cbdc47f6f60b0714fc4a5f596 git Not specified
CNA Linux Linux affected 8c6f6fa6772696be0c047a711858084b38763728 d1b041080086e91d3733a5438a8c51ad5d3d8e09 git Not specified
CNA Linux Linux affected 8c6f6fa6772696be0c047a711858084b38763728 77695a69baca9b99d95fad09fc78c2318736604f git Not specified
CNA Linux Linux affected 8c6f6fa6772696be0c047a711858084b38763728 184d2e9db27c0f76226b5cad16fe29510a5d2280 git Not specified
CNA Linux Linux affected 8c6f6fa6772696be0c047a711858084b38763728 d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d git Not specified
CNA Linux Linux affected 8c6f6fa6772696be0c047a711858084b38763728 5e67ba9bb531e1ec6599a82a065dea9040b9ce50 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 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/e96d48b37708d53cbdc47f6f60b0714fc4a5f596 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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