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GHSA-55XJ-694J-8FJQ

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

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

riscv: Prevent NULL pointer dereference in machine_kexec_prepare()

A NULL pointer dereference issue is noticed in riscv's machine_kexec_prepare(), where image->segment[i].buf might be NULL and copied unchecked.

The NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by kexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without a check in machine_kexec_prepare():

kexec_file_load -> kimage_file_alloc_init() -> kimage_file_prepare_segments() -> ima_add_kexec_buffer() -> kexec_add_buffer() -> machine_kexec_prepare() -> memcpy()

Address this by adding a check before the data copy attempt.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72013"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Prevent NULL pointer dereference in machine_kexec_prepare()\n\nA NULL pointer dereference issue is noticed in riscv\u0027s\nmachine_kexec_prepare(), where image-\u003esegment[i].buf might be NULL and\ncopied unchecked.\n\nThe NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by\nkexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without\na check in machine_kexec_prepare():\n\n  kexec_file_load\n    -\u003e kimage_file_alloc_init()\n       -\u003e kimage_file_prepare_segments()\n          -\u003e ima_add_kexec_buffer()\n             -\u003e kexec_add_buffer()\n    -\u003e machine_kexec_prepare()\n       -\u003e memcpy()\n\nAddress this by adding a check before the data copy attempt.",
  "id": "GHSA-55xj-694j-8fjq",
  "modified": "2026-08-15T06:32:09Z",
  "published": "2026-08-15T06:32:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72013"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/606cc45e871e34b80a2f63874f069387a5b44176"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ad6954492697681ebcfc1beb0eb384406cd4b65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81bbcff0c053c4f5c711c31a9b72fc492bd96c3f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5f92cc4e24a298bf390b0b189a4b888c0900161"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c462e15497dc40abe369b3be7a2c91ac5d1be6f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5b2752a17efc165793ae38f2c24b5ed9c04ffde"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eadd0c2c76aee6a738f17f251434c77db3c606c8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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