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CVE-2025-37880

Estado: AnalizadaMedia (5.5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-37880",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "065038706f77a56754e8f0c2556dab7e22dfe577",
              "lessThan": "990ddc65173776f1e01e7135d8c1fd5f8fd4d5d2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "065038706f77a56754e8f0c2556dab7e22dfe577",
              "lessThan": "887c5c12e80c8424bd471122d2e8b6b462e12874",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/um/include/linux/time-internal.h",
            "arch/um/kernel/skas/syscall.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.3",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.14.5",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/um/include/linux/time-internal.h",
            "arch/um/kernel/skas/syscall.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-05-09T07:16:09.257",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/887c5c12e80c8424bd471122d2e8b6b462e12874",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/990ddc65173776f1e01e7135d8c1fd5f8fd4d5d2",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: um: solución alternativa para que sched_yield no ceda en modo de viaje en el tiempo. Es posible que la ejecución de sched_yield por un espacio de usuario no provoque la programación en modo de viaje en el tiempo, ya que no ha transcurrido tiempo. En el caso observado, parece tratarse de un bloqueo de giro del espacio de usuario mal implementado en ASAN. Desafortunadamente, con el viaje en el tiempo, causa una ralentización extrema o incluso un bloqueo, dependiendo de la configuración del kernel (CONFIG_UML_MAX_USERSPACE_ITERATIONS). Para solucionarlo, se contabiliza el tiempo del proceso cada vez que ejecuta una llamada al sistema sched_yield."
    }
  ],
  "lastModified": "2026-06-17T09:15:37.440",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "37113523-585F-435F-8DCB-AD5DC1660FC0",
              "versionEndExcluding": "6.14.5"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}