net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr

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Summary

CVECVE-2026-53245
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:42 UTC
Updated2026-07-07 22:17:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr In mrp_pdu_parse_vecattr(), vector attribute events are encoded three per byte and valen tracks the number of events left to process. The parser decrements valen after processing the first and second events from each event byte, but not after processing the third one. When valen is exactly a multiple of three, the loop continues after the last valid event and consumes the next byte as a new event byte, applying a spurious event to the MRP applicant state. Additionally, when valen is zero the parser unconditionally consumes attrlen bytes as FirstValue and advances the offset, even though per IEEE 802.1ak a VectorAttribute with only a LeaveAllEvent has valen of zero and no FirstValue or Vector fields. This corrupts the offset for subsequent PDU parsing. Also, when valen exceeds three the loop crosses byte boundaries but the attribute value is not incremented between the last event of one byte and the first event of the next. This causes the first event of the next byte to use the same attribute value as the third event rather than the next consecutive value. Decrement valen after processing the third event, skip FirstValue consumption when valen is zero, and increment the attribute value at the end of each loop iteration.

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: 0.001840000 probability, percentile 0.081920000 (date 2026-07-04)

Problem Types: NVD-CWE-noinfo

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 febf018d22347b5df94066bca05d0c11a84e839d ae65714d96f68bb252eb20085320bdaacab36c00 git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d 36d259711872e3b2f6cd76a4d270c21931c0f35f git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d cc98717e591a963a616fdf15ecf48eefaf45d758 git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d 6d6e42e8e17f18d61327f8653479c5b5e161ae1d git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d fd9c3a47c670bec6b18f44454cea023f93b5adb3 git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d 42446ca0f3570663e87183c065e0b4def52dfba2 git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d 6eea6494e542a03cdf755a593b7d74f3f7c260fd git Not specified
CNA Linux Linux affected febf018d22347b5df94066bca05d0c11a84e839d 7561c7fbc694308da73300f036719e63e42bf0b4 git Not specified
CNA Linux Linux affected 3.9 Not specified
CNA Linux Linux unaffected 3.9 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7561c7fbc694308da73300f036719e63e42bf0b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/36d259711872e3b2f6cd76a4d270c21931c0f35f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ae65714d96f68bb252eb20085320bdaacab36c00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/42446ca0f3570663e87183c065e0b4def52dfba2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cc98717e591a963a616fdf15ecf48eefaf45d758 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fd9c3a47c670bec6b18f44454cea023f93b5adb3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6eea6494e542a03cdf755a593b7d74f3f7c260fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6d6e42e8e17f18d61327f8653479c5b5e161ae1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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