{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72444",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72444"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "flow_dissector: check device type before reading ETH_ADDRS",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nflow_dissector: check device type before reading ETH_ADDRS\n\n__skb_flow_dissect() unconditionally reads 12 bytes from eth_hdr(skb)\nwhen FLOW_DISSECTOR_KEY_ETH_ADDRS is requested. This assumes the skb\nhas a valid Ethernet header at mac_header, which is not always the case.\n\nThe problem can be triggered by:\n 1. Creating a TUN device in L3 mode (IFF_TUN, hard_header_len=0)\n 2. Attaching a multiq qdisc with a flower filter matching on eth_src\n 3. Sending a packet through AF_PACKET\n\nSince TUN in L3 mode has no link-layer header, mac_header points to\nthe L3 data area. The flow dissector reads 12 bytes of uninitialized\nskb memory, which then propagates through fl_set_masked_key() and is\nused as a rhashtable lookup key in __fl_lookup(), as reported by KMSAN.\n\nRejecting the filter in the control path (at tc filter add time) is\nnot feasible because TC filter blocks can be shared between arbitrary\ndevices -- a filter installed on an Ethernet device may later classify\npackets on a headerless device through a shared block. The device\nassociation is not fixed at filter creation time.\n\nFix this by gating the memcpy on dev->type == ARPHRD_ETHER, which\nensures only true Ethernet-framed packets have their addresses read.\nThis is more precise than the previous hard_header_len >= 12 check,\nwhich would incorrectly pass for non-Ethernet link types like IPoIB\n(ARPHRD_INFINIBAND, hard_header_len=24) and FDDI (hard_header_len=21)\nwhose L2 headers are not in Ethernet format. Additionally check\nskb_mac_header_was_set() to guard against the pathological case where\nmac_header is the unset sentinel (~0U), which would cause eth_hdr() to\nreturn a wild pointer.\n\nFor the act_mirred redirect case (Ethernet packet redirected to a\nnon-Ethernet device sharing a TC block), zeroing the key is the correct\nbehavior: the packet is now being classified on the target device, where\nEthernet address matching is not semantically meaningful.\n\nNote: on non-Ethernet devices, the zeroed key will match a filter\nconfigured with all-zero MAC addresses. This is an improvement over the\nprevious behavior where uninitialized memory could randomly match any\nfilter.",
  "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-2026-72444"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0fe6455b8e1a22414f39c07bc90a1df12b52ec74"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a65860959db594dfc1820c7fdc09285fb7556bf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/594c90b197141944f25991b8314de5c26ee27a7e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6d3bcb0f934d4297ac5fa1c8656ae40694fb601"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/825de39f0c35a112148799b3cbe45af3766c018a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf6e8af2c8be77489bedeae9f8a9654cb710e500"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is hit from TC flower classification (fl_classify) on packets injected locally via AF_PACKET through an L3 TUN with mq/flower qdisc; per kernel guidance TC/netlink qdisc paths are Local, not remotely reachable network stack handlers.\nAC:L - Syzbot and the fix commit show reliable reproduction by creating an L3 TUN, attaching a multiq qdisc with a flower eth_src filter, and sending packets via AF_PACKET; the attacker controls every setup step with no races or rare kernel config.\nPR:L - Exploitation requires CAP_NET_ADMIN to create/configure the TUN and install TC flower filters via rtnetlink, plus CAP_NET_RAW for AF_PACKET sockets; both capabilities are obtainable by an unprivileged user inside a user+network namespace (unshare -Urn).\nUI:N - No victim user action is required; exploitation uses attacker-controlled local syscalls (TUN ioctl, rtnetlink TC setup, AF_PACKET sendmsg) in a namespace they create.\nS:U - Impact stays within the kernel networking/TC subsystem of the host or attacker-controlled namespace; it does not cross VM, sandbox, or IOMMU security boundaries.\nC:H - __skb_flow_dissect copies 12 bytes from eth_hdr(skb) when FLOW_DISSECTOR_KEY_ETH_ADDRS is set; on headerless devices (L3 TUN, ARPHRD_NONE) mac_header points at L3 data or unset headroom, leaking uninitialized or out-of-bounds kernel memory into flow keys used by __fl_lookup.\nI:H - Garbage eth address keys flow through fl_set_masked_key into rhashtable lookup and can spuriously match flower filters, invoking unintended TC actions (police drop, skb mark, act_mirred redirect) that alter packet handling beyond the attacker's own data.\nA:H - When mac_header is the unset sentinel (~0U), eth_hdr() becomes a wild pointer and the memcpy can page-fault with a kernel oops/panic; even without fault, mis-matched filters can apply drop/redirect actions that deny or disrupt packet delivery."
    }
  }
}