{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52912",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-52912"
  ],
  "published": "2026-06-24T07:13:41Z",
  "summary": "netfilter: nf_queue: hold bridge skb->dev while queued",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_queue: hold bridge skb->dev while queued\n\nbr_pass_frame_up() rewrites skb->dev from the ingress port to the bridge\nmaster before queueing bridge LOCAL_IN packets. NFQUEUE only holds\nreferences on state.in/out and bridge physdevs, so a queued bridge\npacket can retain a freed bridge master in skb->dev until reinjection.\n\nWhen the verdict is reinjected later, br_netif_receive_skb() re-enters\nthe receive path with skb->dev still pointing at the freed bridge master,\ntriggering a use-after-free.\n\nStore skb->dev in the queue entry, hold a reference on it for the queue\nlifetime, and use the saved device when dropping queued packets during\nNETDEV_DOWN handling.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-52912"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local control of netfilter/NFQUEUE, bridge device lifecycle, and verdict reinjection through netlink/rtnetlink paths. Remote packets alone cannot force the needed bridge teardown and userspace verdict sequence.\nAC:L - A local attacker can deterministically create a namespace, bridge/veth setup, NFQUEUE rule, queued packet, bridge teardown, and reinjection. There is no race dependent on conditions outside attacker control.\nPR:L - The setup requires CAP_NET_ADMIN, but netfilter and bridge configuration are reachable with CAP_NET_ADMIN inside a user-created network namespace on systems allowing unprivileged user namespaces. This is Low, not High.\nUI:N - No victim action is required once the local attacker runs the exploit sequence. The attacker controls packet injection, queueing, device teardown, and verdict delivery.\nS:U - The impact is kernel memory corruption within the same host security authority. This is a standard local kernel privilege escalation/DoS scenario, not a VM or hardware boundary escape.\nC:H - The bug is a use-after-free of the bridge master net_device retained in skb->dev across NFQUEUE. Kernel UAFs can be leveraged for kernel memory disclosure, so confidentiality impact is High.\nI:H - The stale net_device pointer is dereferenced after free in the receive path and can plausibly be combined with heap reclaim/spraying for memory corruption or control-flow impact. As a kernel UAF, integrity impact is High.\nA:H - At minimum, reinjection can dereference freed net_device memory in netif_receive_skb and crash/oops the kernel. Repeated local triggering makes availability impact High."
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}