CVE-2026-53245

Technical Description

In 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 inc

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References