GHSA-55MC-5J7J-CJ82

Vulnerability from github – Published: 2025-09-15 15:31 – Updated: 2025-12-04 15:30
VLAI
Details

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

drm/bridge: megachips: Fix a null pointer dereference bug

When removing the module we will get the following warning:

[ 31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered [ 31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI [ 31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130 [ 31.921825] Call Trace: [ 31.922533] stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw] [ 31.923139] i2c_device_remove+0x181/0x1f0

The two bridges (stdp2690, stdp4028) do not probe at the same time, so the driver does not call ge_b850v3_resgiter() when probing, causing the driver to try to remove the object that has not been initialized.

Fix this by checking whether both the bridges are probed.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-50317"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-15T15:15:43Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/bridge: megachips: Fix a null pointer dereference bug\n\nWhen removing the module we will get the following warning:\n\n[   31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered\n[   31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI\n[   31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\n[   31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130\n[   31.921825] Call Trace:\n[   31.922533]  stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw]\n[   31.923139]  i2c_device_remove+0x181/0x1f0\n\nThe two bridges (stdp2690, stdp4028) do not probe at the same time, so\nthe driver does not call ge_b850v3_resgiter() when probing, causing the\ndriver to try to remove the object that has not been initialized.\n\nFix this by checking whether both the bridges are probed.",
  "id": "GHSA-55mc-5j7j-cj82",
  "modified": "2025-12-04T15:30:30Z",
  "published": "2025-09-15T15:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50317"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1daf69228e310938177119c4eadcd30fc75c81e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ff673333d46d2c1b053ebd0c1c7c7c79e36943e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21764467ab396d9f08921e0a5ffa1214244e1ad9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4610e7a4111fa3f3ce27c09d6d94008c55f1cd31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5bc20bafcd87ba0858ab772cefc7047cb51bc249"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7371fad5cfe6eada6bb5523c895fd6074b15c2b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/877e92e9b1bdeb580b31a46061005936be902cd4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aaa512ad1e59f2edf8a9e4f2b167a44b24670679"
    }
  ],
  "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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