← Back to CVE Explorer

CVE-2025-38671

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: i2c: qup: jump out of the loop in case of timeout Original logic only sets the return value but doesn't jump out of the loop if the bus is kept active by a client. This is not expected. A malicious or buggy i2c client can hang the kernel in this case and should be avoided. This is observed during a long time test with a PCA953x GPIO extender. Fix it by changing the logic to not only sets the return value, but also jumps out of the loop and return to the caller with -ETIMEDOUT.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-08-22 16:15:42.683000
Last modified
2026-11-05 22:17:23.330000
View original CVE JSON 
{
  "id": "CVE-2025-38671",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-08-22T16:15:42.683",
  "lastModified": "2026-11-05T22:17:23.330",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: qup: jump out of the loop in case of timeout\n\nOriginal logic only sets the return value but doesn't jump out of the\nloop if the bus is kept active by a client. This is not expected. A\nmalicious or buggy i2c client can hang the kernel in this case and\nshould be avoided. This is observed during a long time test with a\nPCA953x GPIO extender.\n\nFix it by changing the logic to not only sets the return value, but also\njumps out of the loop and return to the caller with -ETIMEDOUT."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: i2c: qup: se sale del bucle en caso de tiempo de espera. La lógica original solo establece el valor de retorno, pero no se sale del bucle si un cliente mantiene activo el bus. Esto es inesperado. Un cliente i2c malicioso o con errores puede bloquear el kernel en este caso, por lo que debe evitarse. Esto se observó durante una prueba prolongada con un extensor GPIO PCA953x. Para solucionarlo, cambie la lógica para que no solo establezca el valor de retorno, sino que también se salga del bucle y regrese al llamador con -ETIMEDOUT."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/i2c/busses/i2c-qup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "cbec4406998185e0311ae97dfacc649f9cd79b0b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "acfa2948be630ad857535cb36153697f3cbf9ca9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "d05ec13aa3eb868a60dc961b489053a643863ddc",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "c523bfba46c4b4d7676fb050909533a766698ecd",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "0d33913fce67a93c1eb83396c3c9d6b411dcab33",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "42c4471b30fa203249f476dd42321cd7efb7f6a8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "89459f168b78e5c801dc8b7ad037b62898bc4f57",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbfab1ab065879370541caf0e514987368eb41b2",
              "lessThan": "a7982a14b3012527a9583d12525cd0dc9f8d8934",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/i2c/busses/i2c-qup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.17",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.17",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.4.297",
              "lessThanOrEqual": "5.4.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.241",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.190",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.148",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.101",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.41",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.15.9",
              "lessThanOrEqual": "6.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.16",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-05T21:06:33.438648Z",
          "id": "CVE-2025-38671",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.17",
              "versionEndExcluding": "5.4.297",
              "matchCriteriaId": "D028C1BA-46EE-47CB-AC34-FFCDA3799DCF"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.5",
              "versionEndExcluding": "5.10.241",
              "matchCriteriaId": "D0D21C35-EB8A-488A-BBF9-403E4817E5DD"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.11",
              "versionEndExcluding": "5.15.190",
              "matchCriteriaId": "AD9E597F-3DDE-4D7E-976C-463D0611F13F"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.16",
              "versionEndExcluding": "6.1.148",
              "matchCriteriaId": "3E5B1B93-C244-4B54-B3AB-12C2635A443B"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.2",
              "versionEndExcluding": "6.6.101",
              "matchCriteriaId": "686C7A1C-35F3-495D-9825-94B5BCED2705"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.7",
              "versionEndExcluding": "6.12.41",
              "matchCriteriaId": "7B9B92B6-A7E5-4697-AB94-8432ED55AA05"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.13",
              "versionEndExcluding": "6.15.9",
              "matchCriteriaId": "656D6B8C-4D7B-4385-98B6-44EA4AFADD2E"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "09709862-E348-4378-8632-5A7813EDDC86"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "415BF58A-8197-43F5-B3D7-D1D63057A26E"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "A0517869-312D-4429-80C2-561086E1421C"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*",
              "matchCriteriaId": "85421F4E-C863-4ABF-B4B4-E887CC2F7F92"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*",
              "matchCriteriaId": "3827F0D4-5FEE-4181-B267-5A45E7CA11FC"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*",
              "matchCriteriaId": "7A9C2DE5-43B8-4D73-BDB5-EA55C7671A52"
            }
          ]
        }
      ]
    },
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0d33913fce67a93c1eb83396c3c9d6b411dcab33",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/42c4471b30fa203249f476dd42321cd7efb7f6a8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/89459f168b78e5c801dc8b7ad037b62898bc4f57",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/a7982a14b3012527a9583d12525cd0dc9f8d8934",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/acfa2948be630ad857535cb36153697f3cbf9ca9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/c523bfba46c4b4d7676fb050909533a766698ecd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/cbec4406998185e0311ae97dfacc649f9cd79b0b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/d05ec13aa3eb868a60dc961b489053a643863ddc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ]
    }
  ]
}