GHSA-86MR-R4JR-F66C

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().

udp_tunnel_sock_release() could set sk->sk_user_data to NULL while vxlan_gro_prepare_receive() is running.

Let's check if rcu_dereference_sk_user_data() is NULL after skb_gro_remcsum_init().

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74406"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:42Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().\n\nudp_tunnel_sock_release() could set sk-\u003esk_user_data to NULL\nwhile vxlan_gro_prepare_receive() is running.\n\nLet\u0027s check if rcu_dereference_sk_user_data() is NULL after\nskb_gro_remcsum_init().",
  "id": "GHSA-86mr-r4jr-f66c",
  "modified": "2026-08-17T06:33:43Z",
  "published": "2026-08-15T06:32:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74406"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08f40c0d23c67c3aa4224c3311e134999c721fb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30a45c0bffdd62350261e2f2689fdba426a33578"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a8cde6f7281ea2c4c290f9ad9923b3631defceb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c58c729d32e7cea5772cc44929c6cd61e5a31cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef44dac2a37f86eeae6b88ed10a6d60b35387dfd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f79c80f173fda9545b220c1f094b65fc06c252d0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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