ghsa-xv46-47mw-9vxc
Vulnerability from github
Published
2025-02-27 03:34
Modified
2025-11-03 21:32
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

ipv6: mcast: add RCU protection to mld_newpack()

mld_newpack() can be called without RTNL or RCU being held.

Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.

Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21758"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-27T03:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: add RCU protection to mld_newpack()\n\nmld_newpack() can be called without RTNL or RCU being held.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net-\u003eipv6.igmp_sk\nsocket under RCU protection.",
  "id": "GHSA-xv46-47mw-9vxc",
  "modified": "2025-11-03T21:32:59Z",
  "published": "2025-02-27T03:34:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21758"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.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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