GHSA-C6G6-J52P-PG8H

Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-11-03 18:31
VLAI?
Details

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

ax25: properly unshare skbs in ax25_kiss_rcv()

Bernard Pidoux reported a regression apparently caused by commit c353e8983e0d ("net: introduce per netns packet chains").

skb->dev becomes NULL and we crash in __netif_receive_skb_core().

Before above commit, different kind of bugs or corruptions could happen without a major crash.

But the root cause is that ax25_kiss_rcv() can queue/mangle input skb without checking if this skb is shared or not.

Many thanks to Bernard Pidoux for his help, diagnosis and tests.

We had a similar issue years ago fixed with commit 7aaed57c5c28 ("phonet: properly unshare skbs in phonet_rcv()").

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39848"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-19T16:15:43Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: properly unshare skbs in ax25_kiss_rcv()\n\nBernard Pidoux reported a regression apparently caused by commit\nc353e8983e0d (\"net: introduce per netns packet chains\").\n\nskb-\u003edev becomes NULL and we crash in __netif_receive_skb_core().\n\nBefore above commit, different kind of bugs or corruptions could happen\nwithout a major crash.\n\nBut the root cause is that ax25_kiss_rcv() can queue/mangle input skb\nwithout checking if this skb is shared or not.\n\nMany thanks to Bernard Pidoux for his help, diagnosis and tests.\n\nWe had a similar issue years ago fixed with commit 7aaed57c5c28\n(\"phonet: properly unshare skbs in phonet_rcv()\").",
  "id": "GHSA-c6g6-j52p-pg8h",
  "modified": "2025-11-03T18:31:42Z",
  "published": "2025-09-22T21:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39848"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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