cve-2026-64084

HIGH CVSS 7.8 nvd
Description

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.

Timeline
Published
2026-07-19
Last Modified
2026-09-03
CVSS Details
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
Affected Products
  • linux linux_kernel
Weaknesses (CWE)
CWE-787
CVSS metrics
Version Base Severity Vector Exploitability Impact Source
3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 1.8 5.9 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CPE configurations
OR
CPE Version range Vulnerable
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.10, < 5.10.258 yes
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.11, < 5.15.209 yes
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.16, < 6.1.175 yes
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.2, < 6.6.142 yes
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.7, < 6.12.92 yes
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.13, < 6.18.34 yes
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.19, < 7.0.11 yes
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* — yes
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* — yes
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* — yes
cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* — yes
NVD metadata
NVD status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
Linked Vulnerabilities

No linked vulnerabilities found.

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  "datePublished": "2026-07-19T16:17:49.043",
  "dateUpdated": "2026-09-03T12:37:39.587",
  "description": "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's 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.",
  "id": "CVE-2026-64084",
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        "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's 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."
      }
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    "id": "CVE-2026-64084",
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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            "value": "CWE-787"
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        "source": "nvd@nist.gov",
        "type": "Primary"
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  "severity": "HIGH",
  "source": "nvd",
  "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) cap PDIO scan in get_mult..."
}
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