{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23001",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23001"
  ],
  "published": "2026-01-25T14:36:48Z",
  "summary": "macvlan: fix possible UAF in macvlan_forward_source()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix possible UAF in macvlan_forward_source()\n\nAdd RCU protection on (struct macvlan_source_entry)->vlan.\n\nWhenever macvlan_hash_del_source() is called, we must clear\nentry->vlan pointer before RCU grace period starts.\n\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\n\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u",
  "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-2026-23001"
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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 - The reliable attacker-controlled path requires local rtnetlink manipulation of macvlan source-mode entries or failed macvlan creation, followed by local packet injection through a lower device such as veth/tun. Received frames reach the buggy RX handler, but creating the vulnerable stale source entry is a local operation.\nAC:L - The attacker can create the macvlan/source-entry state and trigger packet delivery repeatedly; the demonstrated stale-entry case is deterministic, and source-entry deletion races are attacker-controllable with concurrent netlink and packet activity.\nPR:L - The setup path requires CAP_NET_ADMIN for RTM_NEWLINK/RTM_SETLINK/RTM_DELLINK, but this is reachable by an unprivileged local user in a user-created user/net namespace on systems allowing user namespaces. It does not require real init-namespace root.\nUI:N - No victim action is required once the local attacker runs the netlink operations and injects matching frames. Exploitation is driven entirely by attacker-controlled local processes.\nS:U - The vulnerability corrupts or dereferences memory within the same kernel security authority. It is a standard kernel memory-safety issue, not a VM escape or cross-scope boundary violation.\nC:H - This is a use-after-free involving a freed macvlan/net_device-private object, and reclaimed heap contents can be exposed or used as attacker-shaped kernel pointers. Per kernel CVSS guidance, UAFs are scored as high confidentiality impact.\nI:H - The freed object is later used as a live macvlan_dev and passed into forwarding/statistics paths, giving plausible control-flow or write-primitive opportunities after heap reclaim. Per kernel CVSS guidance, UAF memory corruption is high integrity impact.\nA:H - Syzbot observed a KASAN slab-use-after-free in macvlan_forward_source(), and the bug can crash or panic the kernel. A kernel UAF reachable on demand is high availability impact."
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}