GHSA-QRHR-9Q6X-9GG9

Vulnerability from github – Published: 2025-03-18 21:31 – Updated: 2025-03-18 21:31
VLAI
Details

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

ARM: davinci: da850-evm: Avoid NULL pointer dereference

With newer versions of GCC, there is a panic in da850_evm_config_emac() when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:

Unable to handle kernel NULL pointer dereference at virtual address 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1 Hardware name: Generic DT based system PC is at da850_evm_config_emac+0x1c/0x120 LR is at do_one_initcall+0x50/0x1e0

The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall().

Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.

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-2021-47631"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T06:37:04Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: davinci: da850-evm: Avoid NULL pointer dereference\n\nWith newer versions of GCC, there is a panic in da850_evm_config_emac()\nwhen booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000020\npgd = (ptrval)\n[00000020] *pgd=00000000\nInternal error: Oops: 5 [#1] PREEMPT ARM\nModules linked in:\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1\nHardware name: Generic DT based system\nPC is at da850_evm_config_emac+0x1c/0x120\nLR is at do_one_initcall+0x50/0x1e0\n\nThe emac_pdata pointer in soc_info is NULL because davinci_soc_info only\ngets populated on davinci machines but da850_evm_config_emac() is called\non all machines via device_initcall().\n\nMove the rmii_en assignment below the machine check so that it is only\ndereferenced when running on a supported SoC.",
  "id": "GHSA-qrhr-9q6x-9gg9",
  "modified": "2025-03-18T21:31:58Z",
  "published": "2025-03-18T21:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47631"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c06f476e5b74bcabb8c4a2fba55864a37e62843b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5628533a3ece64235d04fe11ec44d2be99e423d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c64e2ed5cc376e137e572babfd2edc38b2cfb61b"
    }
  ],
  "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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