Answer in brief
CVE-2026-98487 records a High severity (CVSS 7.8) vulnerability in net: bridge: mdb: restart port group walk after deletion. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a6acb535afb2a3b688a7858f05b61f0433e480d5 <46ec55855c972504258c371677ac039ba20e5d12 || >=a6acb535afb2a3b688a7858f05b61f0433e480d5 <ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe || >=a6acb535afb2a3b688a7858f05b61f0433e480d5 <fe2a42789c12eb7c5d3a42191e2cc735a6c35ead || >=a6acb535afb2a3b688a7858f05b61f0433e480d5 <ab1404ac81154a89fb61ac50ae9a04cd8d4834dc | 46ec55855c972504258c371677ac039ba20e5d12, ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe, fe2a42789c12eb7c5d3a42191e2cc735a6c35ead, ab1404ac81154a89fb61ac50ae9a04cd8d4834dc |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.