GHSA-85C9-WPP9-8PG8

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-13 21:31
VLAI?
Details

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

misc: bcm_vk: Fix possible null-pointer dereferences in bcm_vk_read()

In the function bcm_vk_read(), the pointer entry is checked, indicating that it can be NULL. If entry is NULL and rc is set to -EMSGSIZE, the following code may cause null-pointer dereferences:

struct vk_msg_blk tmp_msg = entry->to_h_msg[0]; set_msg_id(&tmp_msg, entry->usr_msg_id); tmp_msg.size = entry->to_h_blks - 1;

To prevent these possible null-pointer dereferences, copy to_h_msg, usr_msg_id, and to_h_blks from iter into temporary variables, and return these temporary variables to the application instead of accessing them through a potentially NULL entry.

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-2025-71291"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:28Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: bcm_vk: Fix possible null-pointer dereferences in bcm_vk_read()\n\nIn the function bcm_vk_read(), the pointer entry is checked, indicating\nthat it can be NULL. If entry is NULL and rc is set to -EMSGSIZE, the\nfollowing code may cause null-pointer dereferences:\n\n  struct vk_msg_blk tmp_msg = entry-\u003eto_h_msg[0];\n  set_msg_id(\u0026tmp_msg, entry-\u003eusr_msg_id);\n  tmp_msg.size = entry-\u003eto_h_blks - 1;\n\nTo prevent these possible null-pointer dereferences, copy to_h_msg,\nusr_msg_id, and to_h_blks from iter into temporary variables, and return\nthese temporary variables to the application instead of accessing them\nthrough a potentially NULL entry.",
  "id": "GHSA-85c9-wpp9-8pg8",
  "modified": "2026-05-13T21:31:56Z",
  "published": "2026-05-06T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71291"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20f2d9dbe5e972516f8f9948d7ae5b95d1ad77bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3842f93e6e29d5cc1dcb9e5bda70587b444bed69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/741c5a3a0cd893a4218fc0fc8c18403e54fcfb22"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa97ccc3dc1eba9f4537f0410e9dbb0b05ccf2fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba75ecb97d3f4e95d59002c13afb6519205be6cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ece3722169ba93734bfd1f06255e8ab7f19fe964"
    }
  ],
  "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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