CVE-2026-74659
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 te…
Impact
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.
Affected packages
This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/014c062d23c63ec77ef2cf17a0d9363c7441cc94
- https://git.kernel.org/stable/c/06d58b8d2f053ced82e01efaeb6e7c82891eed58
- https://git.kernel.org/stable/c/5912cf1822fbe53ae275c147868740eb384a5d3e
- https://git.kernel.org/stable/c/63488dba65ef91373ef616575b32eb0eb21459f4
- https://git.kernel.org/stable/c/7ebc23ff03668042e0b0e4034bb1518d36198d9e
- https://git.kernel.org/stable/c/a5e385eeb2d6dbbbdebfa050e67c34734ae12693
- https://git.kernel.org/stable/c/e08665218040f8e312abe40f74543186f3c2c941