{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23209",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23209"
  ],
  "published": "2026-02-14T16:28:50Z",
  "summary": "macvlan: fix error recovery in macvlan_common_newlink()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix error recovery in macvlan_common_newlink()\n\nvalis provided a nice repro to crash the kernel:\n\nip link add p1 type veth peer p2\nip link set address 00:00:00:00:00:20 dev p1\nip link set up dev p1\nip link set up dev p2\n\nip link add mv0 link p2 type macvlan mode source\nip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20\n\nping -c1 -I p1 1.2.3.4\n\nHe also gave a very detailed analysis:\n\n<quote valis>\n\nThe issue is triggered when a new macvlan link is created  with\nMACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or\nMACVLAN_MACADDR_SET) parameter, lower device already has a macvlan\nport and register_netdevice() called from macvlan_common_newlink()\nfails (e.g. because of the invalid link name).\n\nIn this case macvlan_hash_add_source is called from\nmacvlan_change_sources() / macvlan_common_newlink():\n\nThis adds a reference to vlan to the port's vlan_source_hash using\nmacvlan_source_entry.\n\nvlan is a pointer to the priv data of the link that is being created.\n\nWhen register_netdevice() fails, the error is returned from\nmacvlan_newlink() to rtnl_newlink_create():\n\n        if (ops->newlink)\n                err = ops->newlink(dev, &params, extack);\n        else\n                err = register_netdevice(dev);\n        if (err < 0) {\n                free_netdev(dev);\n                goto out;\n        }\n\nand free_netdev() is called, causing a kvfree() on the struct\nnet_device that is still referenced in the source entry attached to\nthe lower device's macvlan port.\n\nNow all packets sent on the macvlan port with a matching source mac\naddress will trigger a use-after-free in macvlan_forward_source().\n\n</quote valis>\n\nWith all that, my fix is to make sure we call macvlan_flush_sources()\nregardless of @create value whenever \"goto destroy_macvlan_port;\"\npath is taken.\n\nMany thanks to valis for following up on this issue.",
  "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-2026-23209"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Triggering the vulnerability requires CAP_NET_ADMIN to create macvlan interfaces, which is reachable via user namespaces (unshare -Urn) by an unprivileged local user. The setup is local even though the UAF is triggered by network packets.\nAC:L - The vulnerability is deterministically triggered by a straightforward sequence: create a macvlan source with a known-bad interface name to cause register_netdevice() failure, then send a packet with the matching source MAC. No race condition or special conditions needed.\nPR:L - Requires CAP_NET_ADMIN for RTM_NEWLINK netlink operations, but this capability is obtainable by any unprivileged user through user namespaces (unshare -Urn), as netlink_net_capable checks against the network namespace's user_ns, not init_user_ns.\nUI:N - No user interaction is needed. The attacker sets up the vulnerable macvlan configuration and triggers the UAF by sending packets on the lower device, all without any victim action.\nS:U - The vulnerability operates within the kernel's security context. While it allows kernel code execution, it does not cross a virtualization or sandbox boundary \u2014 it is standard kernel privilege escalation.\nC:H - The use-after-free in macvlan_forward_source() dereferences a freed macvlan_dev structure. An attacker can reclaim the freed memory via heap spraying, enabling arbitrary kernel memory reads through controlled object contents.\nI:H - The UAF accesses and writes to the freed macvlan_dev structure (e.g., macvlan_count_rx updates statistics). With heap spraying to reclaim the freed object, this provides arbitrary write primitives that can be leveraged for code execution.\nA:H - The use-after-free causes dereferencing of freed memory, which reliably causes kernel crashes (oops/panic) when the freed memory is reclaimed for other purposes. The reproducer in the commit message demonstrates a reliable crash."
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}