« Volver al listado

CVE-2025-38522

Estado: AnalizadaMedia (5.5)—

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

sched/ext: Prevent update_locked_rq() calls with NULL rq

Avoid invoking update_locked_rq() when the runqueue (rq) pointer is NULL in the SCX_CALL_OP and SCX_CALL_OP_RET macros.

Previously, calling update_locked_rq(NULL) with preemption enabled could trigger the following warning:

This happens because __this_cpu_write() is unsafe to use in preemptible context.

rq is NULL when an ops invoked from an unlocked context. In such cases, we don't need to store any rq, since the value should already be NULL (unlocked). Ensure that update_locked_rq() is only called when rq is non-NULL, preventing calling __this_cpu_write() on preemptible context.

Detalles técnicos trazas, registros y código del informe original
    BUG: using __this_cpu_write() in preemptible [00000000]

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)

Mostrar
{
  "id": "CVE-2025-38522",
  "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": "18853ba782bef65fc81ef2b3370382e5b479c5eb",
              "lessThan": "237c43037b336e36a49eb9f2daac1c7719ec7f8b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "18853ba782bef65fc81ef2b3370382e5b479c5eb",
              "lessThan": "e14fd98c6d66cb76694b12c05768e4f9e8c95664",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.15.8",
              "versionType": "semver",
              "lessThanOrEqual": "6.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-08-16T12:15:27.523",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/237c43037b336e36a49eb9f2daac1c7719ec7f8b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e14fd98c6d66cb76694b12c05768e4f9e8c95664",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/ext: Prevent update_locked_rq() calls with NULL rq\n\nAvoid invoking update_locked_rq() when the runqueue (rq) pointer is NULL\nin the SCX_CALL_OP and SCX_CALL_OP_RET macros.\n\nPreviously, calling update_locked_rq(NULL) with preemption enabled could\ntrigger the following warning:\n\n    BUG: using __this_cpu_write() in preemptible [00000000]\n\nThis happens because __this_cpu_write() is unsafe to use in preemptible\ncontext.\n\nrq is NULL when an ops invoked from an unlocked context. In such cases, we\ndon't need to store any rq, since the value should already be NULL\n(unlocked). Ensure that update_locked_rq() is only called when rq is\nnon-NULL, preventing calling __this_cpu_write() on preemptible context."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched/ext: Evitar llamadas a update_locked_rq() con rq NULL Evite invocar update_locked_rq() cuando el puntero de la cola de ejecución (rq) sea NULL en las macros SCX_CALL_OP y SCX_CALL_OP_RET. Anteriormente, llamar a update_locked_rq(NULL) con la preempción habilitada podría desencadenar la siguiente advertencia: ERROR: usar __this_cpu_write() en un contexto preemptible [00000000] Esto sucede porque __this_cpu_write() no es seguro para usar en un contexto preemptible. rq es NULL cuando se invoca una operación desde un contexto desbloqueado. En tales casos, no necesitamos almacenar ninguna rq, ya que el valor ya debería ser NULL (desbloqueado). Asegúrese de que update_locked_rq() solo se llame cuando rq no sea NULL, lo que evita llamar a __this_cpu_write() en un contexto preemptible."
    }
  ],
  "lastModified": "2026-06-17T09:17:02.310",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E4FF6A82-1356-472F-9877-C09CC5AAA925",
              "versionEndExcluding": "6.15.8",
              "versionStartIncluding": "6.15.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A1ECC65A-EE37-4479-8E99-4BB68A22A31F"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C300BA32-5854-4B59-A00A-18A402F291D0"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "09709862-E348-4378-8632-5A7813EDDC86"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "415BF58A-8197-43F5-B3D7-D1D63057A26E"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A0517869-312D-4429-80C2-561086E1421C"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "85421F4E-C863-4ABF-B4B4-E887CC2F7F92"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3827F0D4-5FEE-4181-B267-5A45E7CA11FC"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}