GHSA-RXHV-MW63-W89C

Vulnerability from github – Published: 2024-10-21 18:30 – Updated: 2026-05-12 12:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

net: add more sanity checks to qdisc_pkt_len_init()

One path takes care of SKB_GSO_DODGY, assuming skb->len is bigger than hdr_len.

virtio_net_hdr_to_skb() does not fully dissect TCP headers, it only make sure it is at least 20 bytes.

It is possible for an user to provide a malicious 'GSO' packet, total length of 80 bytes.

  • 20 bytes of IPv4 header
  • 60 bytes TCP header
  • a small gso_size like 8

virtio_net_hdr_to_skb() would declare this packet as a normal GSO packet, because it would see 40 bytes of payload, bigger than gso_size.

We need to make detect this case to not underflow qdisc_skb_cb(skb)->pkt_len.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2024-49948"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T18:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add more sanity checks to qdisc_pkt_len_init()\n\nOne path takes care of SKB_GSO_DODGY, assuming\nskb-\u003elen is bigger than hdr_len.\n\nvirtio_net_hdr_to_skb() does not fully dissect TCP headers,\nit only make sure it is at least 20 bytes.\n\nIt is possible for an user to provide a malicious \u0027GSO\u0027 packet,\ntotal length of 80 bytes.\n\n- 20 bytes of IPv4 header\n- 60 bytes TCP header\n- a small gso_size like 8\n\nvirtio_net_hdr_to_skb() would declare this packet as a normal\nGSO packet, because it would see 40 bytes of payload,\nbigger than gso_size.\n\nWe need to make detect this case to not underflow\nqdisc_skb_cb(skb)-\u003epkt_len.",
  "id": "GHSA-rxhv-mw63-w89c",
  "modified": "2026-05-12T12:32:11Z",
  "published": "2024-10-21T18:30:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49948"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1eebe602a8d8264a12e35e39d0645fa88dbbacdd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2415f465730e48b6e38da1c7c097317bf5dd2d20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/473426a1d53a68dd1e718e6cd00d57936993fa6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/566a931a1436d0e0ad13708ea55479b95426213c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b0ee571d20a238a22722126abdfde61f1b2bdd0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab9a9a9e9647392a19e7a885b08000e89c86b535"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7d1a28f5dd57b4d83def876f8d7b4403bd37df9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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