net: bridge: use option bits for CFM/MRP frame handlers

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Summary

CVECVE-2026-97615
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:15 UTC
Updated2026-09-25 11:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: bridge: use option bits for CFM/MRP frame handlers CFM and MRP register a global br_frame_type whose hlist_node is linked into the per-bridge frame_type_list when the first MEP/MRP instance is created. Enabling the protocol on multiple bridges therefore inserts the same node into multiple lists. Unregistering it on one bridge then corrupts list state belonging to another. These handlers can only be installed once per bridge, and they are uncommon. Track their per-bridge enable state with net_bridge option bits, which already live on the Rx hot cache line, and dispatch the matching handler directly from the receive path. Check both bits together first as an unlikely case. Remove the generic frame_type_list and br_frame_type helpers, which have had no other users since CFM and MRP were added. That shrinks struct net_bridge by 8 bytes and drops the list walk from the fast path. When neither protocol is compiled in, BR_CFM_MRP_OPTS is 0 and the compiler prunes the branch.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 90c628dd47ff4178f645b34938470bf43d02d123 994fd705ca498223d188024cde833739a9dddbd2 git Not specified
CNA Linux Linux affected 90c628dd47ff4178f645b34938470bf43d02d123 42e033c8f30fd2923ccac3373ae70797e521dae1 git Not specified
CNA Linux Linux affected 90c628dd47ff4178f645b34938470bf43d02d123 7a49e6b16f36b8e085521699adbca3e321b6dd0c git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/994fd705ca498223d188024cde833739a9dddbd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a49e6b16f36b8e085521699adbca3e321b6dd0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42e033c8f30fd2923ccac3373ae70797e521dae1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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