ghsa-cpp9-j2fg-pjvm
Vulnerability from github
Published
2025-12-24 12:30
Modified
2025-12-24 12:30
Details

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

coresight: ETR: Fix ETR buffer use-after-free issue

When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed and enabled again, currently sysfs_buf will point to the newly allocated memory(buf_new) and free the old memory(buf_old). But the etr_buf that is being used by the ETR remains pointed to buf_old, not updated to buf_new. In this case, it will result in a memory use-after-free issue.

Fix this by checking ETR's mode before updating and releasing buf_old, if the mode is CS_MODE_SYSFS, then skip updating and releasing it.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68376"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T11:16:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: ETR: Fix ETR buffer use-after-free issue\n\nWhen ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed\nand enabled again, currently sysfs_buf will point to the newly\nallocated memory(buf_new) and free the old memory(buf_old). But the\netr_buf that is being used by the ETR remains pointed to buf_old, not\nupdated to buf_new. In this case, it will result in a memory\nuse-after-free issue.\n\nFix this by checking ETR\u0027s mode before updating and releasing buf_old,\nif the mode is CS_MODE_SYSFS, then skip updating and releasing it.",
  "id": "GHSA-cpp9-j2fg-pjvm",
  "modified": "2025-12-24T12:30:30Z",
  "published": "2025-12-24T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68376"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70acbc9c77686b7a521af6d7a543dcd9c324cf07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cda077a19f5c8d6ec61e5b97deca203d95e3a422"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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