CVE-2026-53245
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel MRP subsystem, a vulnerability was found in the mrp_pdu_parse_vecattr() function. Parsing errors in vector attributes can lead to incorrect packet processing, including spurious events, skipped FirstValue fields, and incorrect attribute value incrementation.
Risk Assessment
The organization is at risk of disruptions in MRP-based network protocols (e.g., MVRP, MMRP), potentially causing incorrect VLAN or bridge configuration, and in extreme cases leading to DoS attacks or unauthorized access.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit 0b8c5f5a5a5a). Monitor official security advisories from your distribution and apply the patch as soon as it is available.
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Original NVD description (English source)
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.