CVE-2026-31740 (GCVE-0-2026-31740)
Vulnerability from cvelistv5
Published
2026-05-01 14:14
Modified
2026-05-11 22:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: counter: rz-mtu3-cnt: do not use struct rz_mtu3_channel's dev member The counter driver can use HW channels 1 and 2, while the PWM driver can use HW channels 0, 1, 2, 3, 4, 6, 7. The dev member is assigned both by the counter driver and the PWM driver for channels 1 and 2, to their own struct device instance, overwriting the previous value. The sub-drivers race to assign their own struct device pointer to the same struct rz_mtu3_channel's dev member. The dev member of struct rz_mtu3_channel is used by the counter sub-driver for runtime PM. Depending on the probe order of the counter and PWM sub-drivers, the dev member may point to the wrong struct device instance, causing the counter sub-driver to do runtime PM actions on the wrong device. To fix this, use the parent pointer of the counter, which is assigned during probe to the correct struct device, not the struct device pointer inside the shared struct rz_mtu3_channel.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0be8907359df4c62319f5cb2c6981ff0d9ebf35a
Version: 0be8907359df4c62319f5cb2c6981ff0d9ebf35a
Version: 0be8907359df4c62319f5cb2c6981ff0d9ebf35a
Version: 0be8907359df4c62319f5cb2c6981ff0d9ebf35a
Version: 0be8907359df4c62319f5cb2c6981ff0d9ebf35a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/counter/rz-mtu3-cnt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/counter/rz-mtu3-cnt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "6.4",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncounter: rz-mtu3-cnt: do not use struct rz_mtu3_channel\u0027s dev member\n\nThe counter driver can use HW channels 1 and 2, while the PWM driver can\nuse HW channels 0, 1, 2, 3, 4, 6, 7.\n\nThe dev member is assigned both by the counter driver and the PWM driver\nfor channels 1 and 2, to their own struct device instance, overwriting\nthe previous value.\n\nThe sub-drivers race to assign their own struct device pointer to the\nsame struct rz_mtu3_channel\u0027s dev member.\n\nThe dev member of struct rz_mtu3_channel is used by the counter\nsub-driver for runtime PM.\n\nDepending on the probe order of the counter and PWM sub-drivers, the\ndev member may point to the wrong struct device instance, causing the\ncounter sub-driver to do runtime PM actions on the wrong device.\n\nTo fix this, use the parent pointer of the counter, which is assigned\nduring probe to the correct struct device, not the struct device pointer\ninside the shared struct rz_mtu3_channel."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:14:50.719Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/28a371be901ef44ee03726c2575d7d6795521fe0"
        },
        {
          "url": "https://git.kernel.org/stable/c/633dfbf0eb2766c597c1a59dd83035c82e14791d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6562290225c197e2e193a53de2a517815288dcd1"
        },
        {
          "url": "https://git.kernel.org/stable/c/63be324c795262f0e316c6fe9b329d83afa1ec93"
        },
        {
          "url": "https://git.kernel.org/stable/c/2932095c114b98cbb40ccf34fc00d613cb17cead"
        }
      ],
      "title": "counter: rz-mtu3-cnt: do not use struct rz_mtu3_channel\u0027s dev member",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31740",
    "datePublished": "2026-05-01T14:14:36.183Z",
    "dateReserved": "2026-03-09T15:48:24.138Z",
    "dateUpdated": "2026-05-11T22:14:50.719Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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