ghsa-vp2p-wqj6-25wf
Vulnerability from github
Published
2024-10-21 18:30
Modified
2025-11-04 00:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

net/xen-netback: prevent UAF in xenvif_flush_hash()

During the list_for_each_entry_rcu iteration call of xenvif_flush_hash, kfree_rcu does not exist inside the rcu read critical section, so if kfree_rcu is called when the rcu grace period ends during the iteration, UAF occurs when accessing head->next after the entry becomes free.

Therefore, to solve this, you need to change it to list_for_each_entry_safe.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-49936"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T18:15:15Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/xen-netback: prevent UAF in xenvif_flush_hash()\n\nDuring the list_for_each_entry_rcu iteration call of xenvif_flush_hash,\nkfree_rcu does not exist inside the rcu read critical section, so if\nkfree_rcu is called when the rcu grace period ends during the iteration,\nUAF occurs when accessing head-\u003enext after the entry becomes free.\n\nTherefore, to solve this, you need to change it to list_for_each_entry_safe.",
  "id": "GHSA-vp2p-wqj6-25wf",
  "modified": "2025-11-04T00:31:42Z",
  "published": "2024-10-21T18:30:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49936"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda"
    },
    {
      "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:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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