CVE-2026-98487net: bridge: mdb: restart port group walk after deletion
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net: bridge: mdb: restart port group walk after deletion br_mdb_flush_pgs() keeps a pointer-to-pointer cursor while walking mp->ports. br_multicast_del_pg() can re-enter the same MDB entry through br_multicast_sg_del_exclude_ports() and unlink other port groups. If the cursor points into one of those groups, the next iteration dereferences a stale cursor and can leave mp->ports pointing at freed memory. A following RTM_GETMDB exposes the dangling pointer: BUG: KASAN: slab-use-after-free in br_mdb_dump Read of size 8 br_mdb_dump rtnl_mdb_dump rtnl_dumpit netlink_dump Reset the cursor to mp->ports after every deletion. The deletion removes at least the selected group, so the restarted walk always makes progress.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from a6acb535afb2a3b688a7858f05b61f0433e480d5 before 46ec55855c972504258c371677ac039ba20e5d12; from a6acb535afb2a3b688a7858f05b61f0433e480d5 before ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe; from a6acb535afb2a3b688a7858f05b61f0433e480d5 before fe2a42789c12eb7c5d3a42191e2cc735a6c35ead; from a6acb535afb2a3b688a7858f05b61f0433e480d5 before ab1404ac81154a89fb61ac50ae9a04cd8d4834dc | CNA record |
References
- https://git.kernel.org/stable/c/46ec55855c972504258c371677ac039ba20e5d12
- https://git.kernel.org/stable/c/ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe
- https://git.kernel.org/stable/c/fe2a42789c12eb7c5d3a42191e2cc735a6c35ead
- https://git.kernel.org/stable/c/ab1404ac81154a89fb61ac50ae9a04cd8d4834dc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.