ghsa-v3qr-5fr6-xpwv
Vulnerability from github
Published
2025-05-09 09:33
Modified
2025-11-12 21:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

um: work around sched_yield not yielding in time-travel mode

sched_yield by a userspace may not actually cause scheduling in time-travel mode as no time has passed. In the case seen it appears to be a badly implemented userspace spinlock in ASAN. Unfortunately, with time-travel it causes an extreme slowdown or even deadlock depending on the kernel configuration (CONFIG_UML_MAX_USERSPACE_ITERATIONS).

Work around it by accounting time to the process whenever it executes a sched_yield syscall.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37880"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-09T07:16:09Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\num: work around sched_yield not yielding in time-travel mode\n\nsched_yield by a userspace may not actually cause scheduling in\ntime-travel mode as no time has passed. In the case seen it appears to\nbe a badly implemented userspace spinlock in ASAN. Unfortunately, with\ntime-travel it causes an extreme slowdown or even deadlock depending on\nthe kernel configuration (CONFIG_UML_MAX_USERSPACE_ITERATIONS).\n\nWork around it by accounting time to the process whenever it executes a\nsched_yield syscall.",
  "id": "GHSA-v3qr-5fr6-xpwv",
  "modified": "2025-11-12T21:31:03Z",
  "published": "2025-05-09T09:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37880"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/887c5c12e80c8424bd471122d2e8b6b462e12874"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/990ddc65173776f1e01e7135d8c1fd5f8fd4d5d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da780c4a075ba2deb05ae29f0af4a990578c7901"
    }
  ],
  "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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