net: bridge: mcast: properly convert mglist to rcu

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Summary

CVECVE-2026-98026
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:31 UTC
Updated2026-09-25 11:17:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: bridge: mcast: properly convert mglist to rcu Sashiko reported a bug [1] that br_multicast_del_port_group unlists the port group not using proper rcu helper that preserves the next pointer and after that immediately frees the port group without waiting for rcu grace period. The only rcu walker of mglist is br_multicast_list_adjacent() and it turns out that function has always been buggy because mglist was never properly converted to RCU. Fix it by converting it to rcu and moving its initialization after eth_addr's. Initializing p->next can use RCU_INIT_POINTER because we have a barrier from the hlist_add_head_rcu call later, besides we're initializing an unpublished structure anyway. [1] https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260826014200.362304-1-littleddfu%40gmail.com

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.053860000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 98247c8264d2076f81fa114bdfa2c2271953ac7c git Not specified
CNA Linux Linux affected 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 38ab2a435001a3c4dbeb70a52f5921e1ccd66f55 git Not specified
CNA Linux Linux affected 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 f7bf57e94a5d6214b87be08486cb33836fbfa573 git Not specified
CNA Linux Linux affected 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 4b772869a1e5f9da5cef5b9c722ec0aa424ee0a0 git Not specified
CNA Linux Linux affected 3.16 Not specified
CNA Linux Linux unaffected 3.16 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* 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/38ab2a435001a3c4dbeb70a52f5921e1ccd66f55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f7bf57e94a5d6214b87be08486cb33836fbfa573 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b772869a1e5f9da5cef5b9c722ec0aa424ee0a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/98247c8264d2076f81fa114bdfa2c2271953ac7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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