{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  amt: Don't support cross-netns setup.  When a lower device is unregistered, amt_device_event() tries to unregister its upper AMT device, but it has two problems.    1. amt_lookup_upper_dev() looks up an upper device in the       lower device's netns only    2. amt_device_event() unregisters a single upper device only  If AMT device is created on a lower device in another netns, removing the lower device triggers the splat below and gets stuck until all upper devices are removed. [0]  The cross-netns setup seems unintentional considering 1. and the following points:    * amt_link_setup() sets dev-\u003enetns_immutable to true   * skb_scrub_packet() is not called in the fast path   * iproute2 binary fails to find cross-netns lower device via     link-netns:       # ip -n ns1 link add amt0 link-netns ns2 type amt dev veth1       Cannot find device \"veth1\"  Instead of supporting it properly and preparing for per-netns netdev unreg, let's forbid cross-netns setup.  Note that the problem 2. needs a separate fix.  [0]: WARNING: net/core/dev.c:12518 at unregister_netdevice_many_notify+0x1cce/0x2250, CPU#48: ip/2031 Modules linked in: CPU: 48 UID: 0 PID: 2031 Comm: ip Not tainted 7.2.0-rc5+ #27 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 RIP: 0010:unregister_netdevice_many_notify (net/core/dev.c:12518) Code: 89 ef e8 d5 52 ae fe e9 d0 f4 ff ff 48 8d 3d f9 3b 9c 02 48 c7 c6 c0 0b 63 84 ba ab 1f 00 00 67 48 0f b9 3a e9 65 ff ff ff 90 \u003c0f\u003e 0b 90 eb 81 48 8d 3d f6 3b 9c 02 48 c7 c6 c0 0b 63 84 ba e2 1f RSP: 0018:ffffc90004abf160 EFLAGS: 00010212 RAX: ffff888104d38260 RBX: ffff88800b0911b8 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff85b9f880 RBP: ffffc90004abf2d0 R08: ffffffff85b9f887 R09: 1ffffffff0b73f10 R10: dffffc0000000000 R11: fffffbfff0b73f11 R12: ffff88800b091d08 R13: ffff88800b091178 R14: dffffc0000000000 R15: ffff88800b091000 FS:  00007f555b86c600(0000) GS:ffff8881942a0000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562107d489c0 CR3: 0000000109a40002 CR4: 0000000000372ef0 Call Trace:  \u003cTASK\u003e  rtnl_dellink (net/core/rtnetlink.c:3632 net/core/rtnetlink.c:3674)  rtnetlink_rcv_msg (net/core/rtnetlink.c:7112)  netlink_rcv_skb (net/netlink/af_netlink.c:2556)  netlink_unicast (net/netlink/af_netlink.c:1319)  netlink_sendmsg (net/netlink/af_netlink.c:1900)  ____sys_sendmsg (net/socket.c:775)  __sys_sendmsg (net/socket.c:2738)  do_syscall_64 (arch/x86/entry/syscall_64.c:63)  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) ... unregister_netdevice: waiting for veth0 to become free. Usage count = 7 ref_tracker: netdev@ffff88800d7496d8 has 3/3 users at      __netdev_adjacent_dev_insert (./include/linux/netdevice.h:4525 ./include/linux/netdevice.h:4554 net/core/dev.c:8791)      __netdev_upper_dev_link (net/core/dev.c:8879 net/core/dev.c:8963)      netdev_upper_dev_link (net/core/dev.c:9009)      amt_newlink (drivers/net/amt.c:3321)",
  "id": "DEBIAN-CVE-2026-90232",
  "modified": "2026-09-18T04:47:41.016791703Z",
  "published": "2026-09-17T17:17:19.043Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90232"
    }
  ],
  "upstream": [
    "CVE-2026-90232"
  ]
}