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CVE-2025-38633

Estado: AnalizadaMedia (5.5)—

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

clk: spacemit: mark K1 pll1_d8 as critical

The pll1_d8 clock is enabled by the boot loader, and is ultimately a parent for numerous clocks, including those used by APB and AXI buses. Guodong Xu discovered that this clock got disabled while responding to getting -EPROBE_DEFER when requesting a reset controller.

The needed clock (CLK_DMA, along with its parents) had already been enabled. To respond to the probe deferral return, the CLK_DMA clock was disabled, and this led to parent clocks also reducing their enable count. When the enable count for pll1_d8 was decremented it became 0, which caused it to be disabled. This led to a system hang.

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Marking that clock critical resolves this by preventing it from being disabled.

Define a new macro CCU_FACTOR_GATE_DEFINE() to allow clock flags to be supplied for a CCU_FACTOR_GATE clock.

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-2025-38633",
  "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": "1b72c59db0add8e47fa116b21f78ed0b09a264f3",
              "lessThan": "10948c00e548e9ad2ce9d765baf26dce2d9b806b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1b72c59db0add8e47fa116b21f78ed0b09a264f3",
              "lessThan": "7554729de27daf6d54bcf8689d863bbe267828bf",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/clk/spacemit/ccu-k1.c",
            "drivers/clk/spacemit/ccu_mix.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/clk/spacemit/ccu-k1.c",
            "drivers/clk/spacemit/ccu_mix.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-08-22T16:15:37.173",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/10948c00e548e9ad2ce9d765baf26dce2d9b806b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7554729de27daf6d54bcf8689d863bbe267828bf",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclk: spacemit: mark K1 pll1_d8 as critical\n\nThe pll1_d8 clock is enabled by the boot loader, and is ultimately a\nparent for numerous clocks, including those used by APB and AXI buses.\nGuodong Xu discovered that this clock got disabled while responding to\ngetting -EPROBE_DEFER when requesting a reset controller.\n\nThe needed clock (CLK_DMA, along with its parents) had already been\nenabled.  To respond to the probe deferral return, the CLK_DMA clock\nwas disabled, and this led to parent clocks also reducing their enable\ncount.  When the enable count for pll1_d8 was decremented it became 0,\nwhich caused it to be disabled.  This led to a system hang.\n\nMarking that clock critical resolves this by preventing it from being\ndisabled.\n\nDefine a new macro CCU_FACTOR_GATE_DEFINE() to allow clock flags to\nbe supplied for a CCU_FACTOR_GATE clock."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: clk: spacemit: marcar K1 pll1_d8 como crítico El reloj pll1_d8 es habilitado por el gestor de arranque y, en última instancia, es un reloj padre para numerosos relojes, incluidos los que utilizan los buses APB y AXI. Guodong Xu descubrió que este reloj se deshabilitaba al responder a la obtención de -EPROBE_DEFER al solicitar un controlador de reinicio. El reloj necesario (CLK_DMA, junto con sus padres) ya se había habilitado. Para responder al retorno de aplazamiento de la sonda, se deshabilitó el reloj CLK_DMA, y esto provocó que los relojes padre también redujeran su contador de habilitaciones. Cuando se decrementó el contador de habilitaciones para pll1_d8, se convirtió en 0, lo que provocó que se deshabilitara. Esto provocó un cuelgue del sistema. Marcar ese reloj como crítico resuelve esto evitando que se deshabilite. Defina una nueva macro CCU_FACTOR_GATE_DEFINE() para permitir que se suministren indicadores de reloj para un reloj CCU_FACTOR_GATE."
    }
  ],
  "lastModified": "2026-06-17T09:17:15.410",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D6BFC4F7-7099-4420-AF39-DD1CEABB8DF9"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}