Answer in brief
CVE-2026-74659 records a Unknown severity vulnerability in net: bridge: mrp: fix uninitialised bytes on the wire. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f7458934b0791c39a001e4d902fc3bf697b439b5 <014c062d23c63ec77ef2cf17a0d9363c7441cc94 || >=f7458934b0791c39a001e4d902fc3bf697b439b5 <7ebc23ff03668042e0b0e4034bb1518d36198d9e || >=f7458934b0791c39a001e4d902fc3bf697b439b5 <06d58b8d2f053ced82e01efaeb6e7c82891eed58 || >=f7458934b0791c39a001e4d902fc3bf697b439b5 <a5e385eeb2d6dbbbdebfa050e67c34734ae12693 || >=f7458934b0791c39a001e4d902fc3bf697b439b5 <5912cf1822fbe53ae275c147868740eb384a5d3e || >=f7458934b0791c39a001e4d902fc3bf697b439b5 <e08665218040f8e312abe40f74543186f3c2c941 || >=f7458934b0791c39a001e4d902fc3bf697b439b5 <63488dba65ef91373ef616575b32eb0eb21459f4 | 014c062d23c63ec77ef2cf17a0d9363c7441cc94, 7ebc23ff03668042e0b0e4034bb1518d36198d9e, 06d58b8d2f053ced82e01efaeb6e7c82891eed58, a5e385eeb2d6dbbbdebfa050e67c34734ae12693, 5912cf1822fbe53ae275c147868740eb384a5d3e, e08665218040f8e312abe40f74543186f3c2c941, 63488dba65ef91373ef616575b32eb0eb21459f4 |
| Linux/Linuxgeneric | 5.14 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
In the Linux kernel, the following vulnerability has been resolved: net: bridge: mrp: fix uninitialised bytes on the wire br_mrp_alloc_test_skb() builds MRP test frames on an skb from dev_alloc_skb(), which does not clear the linear data area. On the MRA ring-role branch the sub-option TLV header is appended with sub_tlv = skb_put(skb, sizeof(*sub_tlv)); sub_tlv->type = BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR; so sub_tlv->length is never written, and the two trailing alignment bytes are appended with a bare skb_put() that does not clear them either. The neighbouring oui and sub_opt regions are explicitly zeroed, so three uninitialised bytes are left in every MRA MRP_Test frame that goes out. Put the sub-option TLV header and the alignment padding in a single skb_put_zero(), which clears both. The AUTO_MGR sub-TLV carries no payload, so the zeroed length field is already the value it should have.
Quoted source text, attributed separately from HOL analysis.