CVE-2026-74480 (GCVE-0-2026-74480)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-10-16 19:05
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() removes p, continuing the loop advances pp through the deleted entry. If multicast-to-unicast was enabled, the bridge can hold multiple port groups for the same port and group with different source MAC addresses. Once multicast-to-unicast is disabled, br_port_group_equal() matches those entries by port only. A fast leave can then delete one entry and continue from its stale next pointer, leaving mp->ports pointing at a deleted port group. Fast leave only needs to remove one matching port group. Break after br_multicast_del_pg() so the loop stops before dereferencing the removed entry.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
Version: 6db6f0eae6052b70885562e1733896647ec1d807
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.