GHSA-GWCV-998J-QCCX

Vulnerability from github – Published: 2024-09-18 09:30 – Updated: 2025-11-04 00:31
VLAI
Details

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

sch/netem: fix use after free in netem_dequeue

If netem_dequeue() enqueues packet to inner qdisc and that qdisc returns __NET_XMIT_STOLEN. The packet is dropped but qdisc_tree_reduce_backlog() is not called to update the parent's q.qlen, leading to the similar use-after-free as Commit e04991a48dbaf382 ("netem: fix return value if duplicate enqueue fails")

Commands to trigger KASAN UaF:

ip link add type dummy ip link set lo up ip link set dummy0 up tc qdisc add dev lo parent root handle 1: drr tc filter add dev lo parent 1: basic classid 1:1 tc class add dev lo classid 1:1 drr tc qdisc add dev lo parent 1:1 handle 2: netem tc qdisc add dev lo parent 2: handle 3: drr tc filter add dev lo parent 3: basic classid 3:1 action mirred egress redirect dev dummy0 tc class add dev lo classid 3:1 drr ping -c1 -W0.01 localhost # Trigger bug tc class del dev lo classid 1:1 tc class add dev lo classid 1:1 drr ping -c1 -W0.01 localhost # UaF

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-46800"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-18T08:15:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch/netem: fix use after free in netem_dequeue\n\nIf netem_dequeue() enqueues packet to inner qdisc and that qdisc\nreturns __NET_XMIT_STOLEN. The packet is dropped but\nqdisc_tree_reduce_backlog() is not called to update the parent\u0027s\nq.qlen, leading to the similar use-after-free as Commit\ne04991a48dbaf382 (\"netem: fix return value if duplicate enqueue\nfails\")\n\nCommands to trigger KASAN UaF:\n\nip link add type dummy\nip link set lo up\nip link set dummy0 up\ntc qdisc add dev lo parent root handle 1: drr\ntc filter add dev lo parent 1: basic classid 1:1\ntc class add dev lo classid 1:1 drr\ntc qdisc add dev lo parent 1:1 handle 2: netem\ntc qdisc add dev lo parent 2: handle 3: drr\ntc filter add dev lo parent 3: basic classid 3:1 action mirred egress\nredirect dev dummy0\ntc class add dev lo classid 3:1 drr\nping -c1 -W0.01 localhost # Trigger bug\ntc class del dev lo classid 1:1\ntc class add dev lo classid 1:1 drr\nping -c1 -W0.01 localhost # UaF",
  "id": "GHSA-gwcv-998j-qccx",
  "modified": "2025-11-04T00:31:29Z",
  "published": "2024-09-18T09:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32008ab989ddcff1a485fa2b4906234c25dc5cd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98c75d76187944296068d685dfd8a1e9fd8c4fdc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db2c235682913a63054e741fe4e19645fdf2d68e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0bddb4de043399f16d1969dad5ee5b984a64e7b"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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