CVE-2026-64085 (GCVE-0-2026-64085)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39
VLAI
Title
hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer adm1266_pmbus_block_xfer() copies the device-supplied block payload into the caller-provided buffer using the device-supplied length: memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); The helper does not know how large data_r is and trusts the device to return at most one record's worth of bytes. adm1266_nvmem_read_blackbox() violates that contract: it advances read_buff inside data->dev_mem in ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns more than 64 bytes on the trailing record (read_buff offset 1984 in the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes before the post-call if (ret != ADM1266_BLACKBOX_SIZE) return -EIO; can reject the response. Contain the fix in the caller without changing the helper signature: read each record into a 255-byte local bounce buffer that matches the helper's maximum output, validate the returned length, and only then copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 7896d87cbb05e097efc113243d4e38f9f8cea16c (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 9d5309500b4607b7198e19f0a3fa13eb864cd5fb (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 6098634cfa711f11a8d65368dc51ec8f7c8241ba (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 60c4b9fe1a3dd012014b1f561a6928a0b5db1126 (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 83e039f0a43e0708515b0479cb7690fb93faaaa0 (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < dd47b8c4a0a8ced442da3f008db28fbbd31feaf0 (git)
Affected: 407dc802a9c0809ca6a48de4b4c63305eb84ef56 , < 43cae21424ff8e33894a0f86c6b80b840c049fd7 (git)
Create a notification for this product.
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)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer\n\nadm1266_pmbus_block_xfer() copies the device-supplied block payload\ninto the caller-provided buffer using the device-supplied length:\n\n\tmemcpy(data_r, \u0026msgs[1].buf[1], msgs[1].buf[0]);\n\nThe helper does not know how large data_r is and trusts the device to\nreturn at most one record\u0027s worth of bytes.  adm1266_nvmem_read_blackbox()\nviolates that contract: it advances read_buff inside data-\u003edev_mem in\nADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to\nwrite up to ADM1266_PMBUS_BLOCK_MAX (255) bytes.  A device that returns\nmore than 64 bytes on the trailing record (read_buff offset 1984 in\nthe 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes\nbefore the post-call\n\n\tif (ret != ADM1266_BLACKBOX_SIZE)\n\t\treturn -EIO;\n\ncan reject the response.\n\nContain the fix in the caller without changing the helper signature:\nread each record into a 255-byte local bounce buffer that matches the\nhelper\u0027s maximum output, validate the returned length, and only then\ncopy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot."
        }
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        "dateUpdated": "2026-07-19T15:39:56.067Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      ],
      "title": "hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64085",
    "datePublished": "2026-07-19T15:39:56.067Z",
    "dateReserved": "2026-07-19T07:54:57.032Z",
    "dateUpdated": "2026-07-19T15:39:56.067Z",
    "state": "PUBLISHED"
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A device that returns\\nmore than 64 bytes on the trailing record (read_buff offset 1984 in\\nthe 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes\\nbefore the post-call\\n\\n\\tif (ret != ADM1266_BLACKBOX_SIZE)\\n\\t\\treturn -EIO;\\n\\ncan reject the response.\\n\\nContain the fix in the caller without changing the helper signature:\\nread each record into a 255-byte local bounce buffer that matches the\\nhelper\u0027s maximum output, validate the returned length, and only then\\ncopy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.\"}],\"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\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"7896d87cbb05e097efc113243d4e38f9f8cea16c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"9d5309500b4607b7198e19f0a3fa13eb864cd5fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"6098634cfa711f11a8d65368dc51ec8f7c8241ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"60c4b9fe1a3dd012014b1f561a6928a0b5db1126\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"83e039f0a43e0708515b0479cb7690fb93faaaa0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"dd47b8c4a0a8ced442da3f008db28fbbd31feaf0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"407dc802a9c0809ca6a48de4b4c63305eb84ef56\",\"lessThan\":\"43cae21424ff8e33894a0f86c6b80b840c049fd7\",\"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/43cae21424ff8e33894a0f86c6b80b840c049fd7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:03:57+00:00",
      "cve": "CVE-2026-64085",
      "id": "CVE-2026-64085",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "200",
      "product_status:known_not_affected": "75",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64085.json",
      "version": "3"
    }
  }
}



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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.