CVE-2026-64084 (GCVE-0-2026-64084)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-08-05 12:39
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR adm1266_gpio_get_multiple() iterates the PDIO portion of the caller-supplied mask using for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) { ... } where ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233), not the number of PDIO pins. The intended upper bound is ADM1266_GPIO_NR + ADM1266_PDIO_NR = 25. gpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip), so the iteration walks find_next_bit() up to 242, reading up to 217 extra bits (a handful of unsigned-long words: four on 64-bit, seven on 32-bit) of whatever lives past the end of the mask in the caller's stack. Any incidental set bit in that range then drives a set_bit(gpio_nr, bits) call that writes past the end of the caller-supplied bits array too -- both out-of-bounds. Substitute ADM1266_PDIO_NR for the constant so the scan stops at the last real PDIO bit.
References
Impacted products
Vendor Product Version
Linux Linux Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
Version: d98dfad35c38c037b37c4adc99df01da571031a5
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/adm1266.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/adm1266.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.10"
            },
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              "status": "unaffected",
              "version": "0",
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            {
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              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
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            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "6.1.175",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR\n\nadm1266_gpio_get_multiple() iterates the PDIO portion of the\ncaller-supplied mask using\n\n\tfor_each_set_bit_from(gpio_nr, mask,\n\t\t\t      ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {\n\t\t...\n\t}\n\nwhere ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233),\nnot the number of PDIO pins.  The intended upper bound is\nADM1266_GPIO_NR + ADM1266_PDIO_NR = 25.\n\ngpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip),\nso the iteration walks find_next_bit() up to 242, reading up to 217\nextra bits (a handful of unsigned-long words: four on 64-bit, seven\non 32-bit) of whatever lives past the end of the mask in the\ncaller\u0027s stack.  Any incidental set bit in that range then drives a\nset_bit(gpio_nr, bits) call that writes past the end of the\ncaller-supplied bits array too -- both out-of-bounds.\n\nSubstitute ADM1266_PDIO_NR for the constant so the scan stops at the\nlast real PDIO bit."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is only reachable through the GPIO character-device ioctl path (gpiolib \u2192 adm1266_gpio_get_multiple), which requires local access to /dev/gpiochip* on a system with an ADM1266 present on I2C; it is not triggered by network packets or physical bus access.\nAC:L - Any caller who can request ADM1266 PDIO lines and issue a multi-line GET_VALUES ioctl reliably enters the flawed loop; no race or victim state beyond attacker-controlled ioctl parameters is required.\nPR:L - Exploitation requires only a local account that can open the GPIO char device and request lines (e.g. root, gpio group membership, or a BMC service account with device access), not full init-namespace CAP_SYS_ADMIN; this is plausible on embedded/BMC deployments where ADM1266 is used.\nUI:N - Once the attacker has GPIO char-device access, triggering the bug is a single ioctl with no additional victim interaction.\nS:U - Impact is kernel stack memory corruption and potential privilege escalation within the same kernel security domain; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The flawed loop performs out-of-bounds reads of up to ~217 bits beyond the 25-bit mask into adjacent kernel stack memory, constituting kernel memory disclosure per OOB-read guidance.\nI:H - Incidental set bits found during the out-of-bounds mask scan drive set_bit() writes past the end of the caller-supplied bits array, causing out-of-bounds kernel stack writes that could be leveraged for control-flow hijacking.\nA:H - Stack corruption from the out-of-bounds writes can cause kernel oops, panic, or hang, satisfying the kernel guidance that memory-corruption bugs warrant High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:39:02.926Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d0593e15fdeb56048a72c5c6e720f702759d0ccd"
        },
        {
          "url": "https://git.kernel.org/stable/c/17cee2f59029039416e8f6303050038eb59ba149"
        },
        {
          "url": "https://git.kernel.org/stable/c/299efd14c2eda7e5fd40025e54addd4151a01081"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d1da9a6be5a8156c532d571c2ed237169f99244"
        },
        {
          "url": "https://git.kernel.org/stable/c/b96c7f0bc0713dc6403912f6527d4ff9168d6fe6"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7834d92251baade796812876e95555e2066fa9f"
        }
      ],
      "title": "hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64084",
    "datePublished": "2026-07-19T15:39:55.417Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-08-05T12:39:02.926Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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