{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-41091",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-41091"
  ],
  "published": "2024-07-29T06:18:26Z",
  "summary": "tun: add missing verification for short frame",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: add missing verification for short frame\n\nThe cited commit missed to check against the validity of the frame length\nin the tun_xdp_one() path, which could cause a corrupted skb to be sent\ndownstack. Even before the skb is transmitted, the\ntun_xdp_one-->eth_type_trans() may access the Ethernet header although it\ncan be less than ETH_HLEN. Once transmitted, this could either cause\nout-of-bound access beyond the actual length, or confuse the underlayer\nwith incorrect or inconsistent header length in the skb metadata.\n\nIn the alternative path, tun_get_user() already prohibits short frame which\nhas the length less than Ethernet header size from being transmitted for\nIFF_TAP.\n\nThis is to drop any frame shorter than the Ethernet header size just like\nhow tun_get_user() does.\n\nCVE: CVE-2024-41091",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-41091"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/32b0aaba5dbc85816898167d9b5d45a22eae82e9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6100e0237204890269e3f934acfc50d35fd6f319"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5ad89b7d01ed4e66fd04734fc63d6e78536692a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb"
    },
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      "url": "https://git.kernel.org/stable/c/8418f55302fa1d2eeb73e16e345167e545c598a5"
    },
    {
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      "url": "https://git.kernel.org/stable/c/049584807f1d797fc3078b68035450a9769eb5c3"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is only reachable through the vhost-net TX ring driven by a local vhost_net file descriptor (or the guest attached to it), not through any network protocol handler; the attacker needs local access to /dev/vhost-net plus a tap backend, or local access inside a VM whose virtio-net device is backed by vhost-net.\nAC:L - Triggering is a single deterministic action \u2014 post a TX descriptor whose length equals sock_hlen so datasize is 0 \u2014 on the default configuration (sk_sndbuf == INT_MAX enables the batch XDP path, zerocopy TX is off by default); no race, no timing window, no memory-layout precondition.\nPR:L - No capability check exists anywhere in drivers/vhost, so opening /dev/vhost-net needs only file permissions (kvm group on typical hosts), and TUNSETIFF's ns_capable(CAP_NET_ADMIN) is trivially obtained via unshare -Urn; in the KVM scenario the attacker holds only guest-side privileges and none on the host.\nUI:N - The attacker drives the entire sequence \u2014 creating the tap, binding the vhost backend, and kicking the virtqueue \u2014 with no action required from any other user; a malicious guest needs only its own already-configured virtio-net device.\nS:C - In the standard KVM deployment, vhost-net/tun is the host-kernel component enforcing the guest's confinement to its virtual NIC, and a guest-supplied short frame corrupts host kernel memory and injects a malformed skb into the host's network stack, bridge and physical NIC \u2014 resources outside the guest's security authority, i.e. a guest-to-host boundary crossing.\nC:H - eth_skb_pull_mac()/eth_skb_pkt_type() dereference the Ethernet header past the end of the valid data, reading stale page-frag heap contents, and the resulting skb carries a length shorter than the headers it claims, so downstream forwarding onto a bridge or physical NIC can transmit adjacent kernel heap bytes and the unbounded downstream over-reads the commit warns about.\nI:H - A corrupted skb with inconsistent length/header metadata is passed into netif_receive_skb() and on through the host stack, where unsigned header-length arithmetic on skb->len < ETH_HLEN underflows and yields out-of-bounds accesses \u2014 memory corruption of this class is leveragable into write primitives and control-flow hijacking.\nA:H - The out-of-bounds access and the malformed skb entering the host network stack readily produce a host kernel oops or panic, and the trigger can be repeated at packet rate from an unprivileged guest, denying service to the host and every other guest on it."
    }
  }
}