CVE-2026-53245

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 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.