CVE-2026-74659

CVE CVE-2026-74659EUVD EUVD-2026-64596Published 2026-08-22T15:32:32.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; f7458934b0791c39a001e4d902fc3bf697b439b5 <06d58b8d2f053ced82e01efaeb6e7c82891eed58; patch: 7.1.9; patch: 6.1.183; patch: 6.18.45; patch: 6.12.104; f7458934b0791c39a001e4d902fc3bf697b439b5 <e08665218040f8e312abe40f74543186f3c2c941; f7458934b0791c39a001e4d902fc3bf697b439b5 <5912cf1822fbe53ae275c147868740eb384a5d3e; 5.14; f7458934b0791c39a001e4d902fc3bf697b439b5 <a5e385eeb2d6dbbbdebfa050e67c34734ae12693; patch: 5.15.216; patch: 6.6.152; patch: 7.2; f7458934b0791c39a001e4d902fc3bf697b439b5 <7ebc23ff03668042e0b0e4034bb1518d36198d9e; f7458934b0791c39a001e4d902fc3bf697b439b5 <014c062d23c63ec77ef2cf17a0d9363c7441cc94; f7458934b0791c39a001e4d902fc3bf697b439b5 <63488dba65ef91373ef616575b32eb0eb21459f4

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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