ghsa-qj2x-5f28-cg38
Vulnerability from github
Published
2025-03-17 21:30
Modified
2025-03-17 21:30
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:

tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()

When the driver fails at alloc_hdlcdev(), and then we remove the driver module, we will get the following splat:

[ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Call Trace: [ 25.077924] [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt]

Fix this by checking whether the 'info->netdev' is a null pointer first.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49307"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:07Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: synclink_gt: Fix null-pointer-dereference in slgt_clean()\n\nWhen the driver fails at alloc_hdlcdev(), and then we remove the driver\nmodule, we will get the following splat:\n\n[   25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI\n[   25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17]\n[   25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0\n[   25.077709] Call Trace:\n[   25.077924]  \u003cTASK\u003e\n[   25.078108]  unregister_hdlc_device+0x16/0x30\n[   25.078481]  slgt_cleanup+0x157/0x9f0 [synclink_gt]\n\nFix this by checking whether the \u0027info-\u003enetdev\u0027 is a null pointer first.",
  "id": "GHSA-qj2x-5f28-cg38",
  "modified": "2025-03-17T21:30:33Z",
  "published": "2025-03-17T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49307"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/078212ad15dbd88840c82c97f12c93d83703c8fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ceb4ca9543a8a788febf6bc8dad2e605e172d5e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/689ca31c542687709ba21ec2195c1fbce34fd029"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a95696bdc0e13f8980f05b54a3b9081963d1256"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba08cbc5b53e151d0acf1930fb526fc65b7f3e65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d68d5e68b7f64de7170f8e04dd9b995c36b2c71c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddd67751ab86c6a65f95c35293c42f85a42ac05d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6e07eb7ebec53ffe81fc2489589320fbe4a6b75"
    }
  ],
  "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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