GHSA-QGF6-M828-GPV5

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

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

rpmsg: core: fix race in driver_override_show() and use core helper

The driver_override_show function reads the driver_override string without holding the device_lock. However, the store function modifies and frees the string while holding the device_lock. This creates a race condition where the string can be freed by the store function while being read by the show function, leading to a use-after-free.

To fix this, replace the rpmsg_string_attr macro with explicit show and store functions. The new driver_override_store uses the standard driver_set_override helper. Since the introduction of driver_set_override, the comments in include/linux/rpmsg.h have stated that this helper must be used to set or clear driver_override, but the implementation was not updated until now.

Because driver_set_override modifies and frees the string while holding the device_lock, the new driver_override_show now correctly holds the device_lock during the read operation to prevent the race.

Additionally, since rpmsg_string_attr has only ever been used for driver_override, removing the macro simplifies the code.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-71274"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:27Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpmsg: core: fix race in driver_override_show() and use core helper\n\nThe driver_override_show function reads the driver_override string\nwithout holding the device_lock. However, the store function modifies\nand frees the string while holding the device_lock. This creates a race\ncondition where the string can be freed by the store function while\nbeing read by the show function, leading to a use-after-free.\n\nTo fix this, replace the rpmsg_string_attr macro with explicit show and\nstore functions. The new driver_override_store uses the standard\ndriver_set_override helper. Since the introduction of\ndriver_set_override, the comments in include/linux/rpmsg.h have stated\nthat this helper must be used to set or clear driver_override, but the\nimplementation was not updated until now.\n\nBecause driver_set_override modifies and frees the string while holding\nthe device_lock, the new driver_override_show now correctly holds the\ndevice_lock during the read operation to prevent the race.\n\nAdditionally, since rpmsg_string_attr has only ever been used for\ndriver_override, removing the macro simplifies the code.",
  "id": "GHSA-qgf6-m828-gpv5",
  "modified": "2026-05-06T12:30:29Z",
  "published": "2026-05-06T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71274"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e4a70f3c30910427e5ea848b799066d67b963d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42023d4b6d2661a40ee2dcf7e1a3528a35c638ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47615557447185917afa432b7958f87583c417cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7654e6e3cd6bdee9602f6063b3c670bd556d7e61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90c8353f471821d7ccd4fe573a2402e056192494"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/954557957177c3c13d7c655976665b1170da5e50"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d66b8074c555e8abb0ae19eea1c9f3635498bdde"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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