ghsa-mwfv-f593-4f6x
Vulnerability from github
Published
2025-04-01 18:30
Modified
2025-11-03 21:33
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:

sched: address a potential NULL pointer dereference in the GRED scheduler.

If kzalloc in gred_init returns a NULL pointer, the code follows the error handling path, invoking gred_destroy. This, in turn, calls gred_offload, where memset could receive a NULL pointer as input, potentially leading to a kernel crash.

When table->opt is NULL in gred_init(), gred_change_table_def() is not called yet, so it is not necessary to call ->ndo_setup_tc() in gred_offload().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21980"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-01T16:15:29Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched: address a potential NULL pointer dereference in the GRED scheduler.\n\nIf kzalloc in gred_init returns a NULL pointer, the code follows the\nerror handling path, invoking gred_destroy. This, in turn, calls\ngred_offload, where memset could receive a NULL pointer as input,\npotentially leading to a kernel crash.\n\nWhen table-\u003eopt is NULL in gred_init(), gred_change_table_def()\nis not called yet, so it is not necessary to call -\u003endo_setup_tc()\nin gred_offload().",
  "id": "GHSA-mwfv-f593-4f6x",
  "modified": "2025-11-03T21:33:26Z",
  "published": "2025-04-01T18:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21980"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f0a152957d64ce45b4c27c687e7d087e8f45079"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/115ef44a98220fddfab37a39a19370497cd718b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f996b4f80c2cef1f9c77275055e7fcba44c9199"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68896dd50180b38ea552e49a6a00b685321e5769"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d02c9acd68950a444acda18d514e2b41f846cb7f"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.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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