CVE-2026-64083 (GCVE-0-2026-64083)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39
VLAI
Title
hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors adm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the pin-status word as pins_status = read_buf[0] + (read_buf[1] << 8); right after i2c_smbus_read_block_data(), guarding only against an error return. A well-behaved device returns 2 bytes for GPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or 1-byte response too. If the device returns 0 bytes, both read_buf slots are uninitialized stack memory; if it returns 1 byte, read_buf[1] is. The composed value then flows through set_bit() into the caller's *bits in adm1266_gpio_get_multiple(), or into the return value of adm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and the char-dev ioctls). That leaks a few bits of kernel stack per request on any device whose firmware glitch, bus error, or hostile slave produces a short block-read response. Add the missing length check to both call sites and surface a short response as -EIO.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < fd9196aad9e5a3845cea17de3405ebc700382142 (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < ee4799becf7d2af3778007e22c2e55c4009a49c7 (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < c603b6c6840ac0c6285f5eefea0de6242710af21 (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946 (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < eb3cd9bb590460c6127145cb245be925d23f5232 (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < 64fa9328948ddcc0f7f3c23ea1756c126d9dffac (git)
Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < a7232f68c43ca62f545049b7f5fbfc75137b843b (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] \u003c\u003c 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return.  A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too.  If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller\u0027s\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:39:54.756Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"
        }
      ],
      "title": "hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64083",
    "datePublished": "2026-07-19T15:39:54.756Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-07-19T15:39:54.756Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "cve": "CVE-2026-64083",
      "date": "2026-07-21",
      "epss": "0.00184",
      "percentile": "0.08251"
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If the device returns 0 bytes, both read_buf\\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\\nis.\\n\\nThe composed value then flows through set_bit() into the caller\u0027s\\n*bits in adm1266_gpio_get_multiple(), or into the return value of\\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\\nrequest on any device whose firmware glitch, bus error, or hostile\\nslave produces a short block-read response.\\n\\nAdd the missing length check to both call sites and surface a short\\nresponse as -EIO.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/hwmon/pmbus/adm1266.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"fd9196aad9e5a3845cea17de3405ebc700382142\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"ee4799becf7d2af3778007e22c2e55c4009a49c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"c603b6c6840ac0c6285f5eefea0de6242710af21\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"eb3cd9bb590460c6127145cb245be925d23f5232\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"64fa9328948ddcc0f7f3c23ea1756c126d9dffac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d98dfad35c38c037b37c4adc99df01da571031a5\",\"lessThan\":\"a7232f68c43ca62f545049b7f5fbfc75137b843b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/hwmon/pmbus/adm1266.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:07:55+00:00",
      "cve": "CVE-2026-64083",
      "id": "CVE-2026-64083",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64083.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-21T13:00:00Z",
      "cve": "CVE-2026-64083",
      "id": "CVE-2026-64083",
      "initial_release_date": "2026-07-21T13:00:00Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64083",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64083.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.