CVE-2026-98487: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: a6acb535afb2a3b688a7858f05b61f0433e480d5 преди 46ec55855c972504258c371677ac039ba20e5d12; a6acb535afb2a3b688a7858f05b61f0433e480d5 преди ab3c4a4c85f2e1e8d04b5c1770dea8412d21c7fe; a6acb535afb2a3b688a7858f05b61f0433e480d5 преди fe2a42789c12eb7c5d3a42191e2cc735a6c35ead; a6acb535afb2a3b688a7858f05b61f0433e480d5 преди ab1404ac81154a89fb61ac50ae9a04cd8d4834dc
• Linux Linux: 6.8; преди 6.8; 6.12.112 до 6.12.*; 6.18.55 до 6.18.*; 7.2.9 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-98487
• https://nvd.nist.gov/vuln/detail/CVE-2026-98487
• 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