{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21761",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-21761"
  ],
  "published": "2025-02-27T02:18:18Z",
  "summary": "openvswitch: use RCU protection in ovs_vport_cmd_fill_info()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: use RCU protection in ovs_vport_cmd_fill_info()\n\novs_vport_cmd_fill_info() can be called without RTNL or RCU.\n\nUse RCU protection and dev_net_rcu() to avoid potential UAF.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21761"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e85a25d1a9985645e796039e843d1de581d2de1e"
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      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached only through the openvswitch generic-netlink family (OVS_VPORT_CMD_NEW/SET/DEL) and through netdev namespace migration triggered by local syscalls; there is no remote or adjacent-network input path.\nAC:L - The attacker controls both sides of the race \u2014 it schedules the netns teardown (dropping the last reference to a namespace it created) and the `ovs_dp_notify_wq`/vport command that re-reads `dev_net(vport->dev)` \u2014 and can repeat the sequence indefinitely until the window is hit.\nPR:L - The vport commands use GENL_UNS_ADMIN_PERM, i.e. `netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)`, which any unprivileged user obtains via `unshare -Urn`; namespace creation and `ip link set ... netns` likewise need only namespaced capabilities, and the module auto-loads on family lookup.\nUI:N - The entire sequence \u2014 datapath creation, port attach, namespace move and teardown \u2014 is performed by the attacker's own processes with no action from any other user.\nS:U - The corruption and its consequences stay within the kernel's own security authority; no hypervisor, IOMMU, or other trust boundary is crossed.\nC:H - Use-after-free read of a freed `struct net`, plus `alloc_netid()` persists the dangling pointer into a live namespace's `netns_ids` IDR where the attacker can resurrect it via RTM_GETNSID/IFLA_TARGET_NETNSID/BPF `get_net_ns_by_id()`, yielding access to reallocated kernel memory and cross-namespace state.\nI:H - `maybe_get_net()` and `put_net()` perform atomic refcount increments/decrements directly on freed slab memory, corrupting whatever object reuses it, and a stale `struct net *` is durably written into a live namespace's IDR \u2014 a standard UAF write primitive leveragable for privilege escalation.\nA:H - Dereferencing and refcount-manipulating a freed `struct net` causes oops/panic, and a spurious `put_net()` can drive `__put_net()`/`cleanup_net()` over a destroyed or reused object, crashing the machine."
    }
  }
}