CVE-2026-63932 (GCVE-0-2026-63932)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
iio: chemical: mhz19b: reject oversized serial replies
Summary
In the Linux kernel, the following vulnerability has been resolved: iio: chemical: mhz19b: reject oversized serial replies mhz19b_receive_buf() appends each serdev chunk into the fixed MHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without checking that the chunk fits in the remaining space. A large callback can therefore overflow st->buf before the command path validates the reply. Reset the reply state before each command and reject oversized serial replies before copying them into the fixed buffer. When an oversized reply is detected, wake the waiter and report -EMSGSIZE instead of overwriting st->buf.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4572a70b3681e38055c78d12fb68cd147bdbee7d , < a5a05410cb34bfa486d63684cdc1f87a3b13f20a (git)
Affected: 4572a70b3681e38055c78d12fb68cd147bdbee7d , < ea69e7a6efa88ef32090a91064c362738cc19ddd (git)
Affected: 4572a70b3681e38055c78d12fb68cd147bdbee7d , < 673478bc29cf72010faaf293c1c8c667393335a0 (git)
Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/chemical/mhz19b.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a5a05410cb34bfa486d63684cdc1f87a3b13f20a",
              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            },
            {
              "lessThan": "ea69e7a6efa88ef32090a91064c362738cc19ddd",
              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            },
            {
              "lessThan": "673478bc29cf72010faaf293c1c8c667393335a0",
              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/chemical/mhz19b.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: chemical: mhz19b: reject oversized serial replies\n\nmhz19b_receive_buf() appends each serdev chunk into the fixed\nMHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without\nchecking that the chunk fits in the remaining space. A large callback\ncan therefore overflow st-\u003ebuf before the command path validates the\nreply.\n\nReset the reply state before each command and reject oversized serial\nreplies before copying them into the fixed buffer. When an oversized\nreply is detected, wake the waiter and report -EMSGSIZE instead of\noverwriting st-\u003ebuf."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:31.460Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd"
        },
        {
          "url": "https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0"
        }
      ],
      "title": "iio: chemical: mhz19b: reject oversized serial replies",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63932",
    "datePublished": "2026-07-19T14:55:31.460Z",
    "dateReserved": "2026-07-19T07:54:57.021Z",
    "dateUpdated": "2026-07-19T14:55:31.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63932",
      "date": "2026-07-21",
      "epss": "0.00198",
      "percentile": "0.09783"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63932\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:11.633\",\"lastModified\":\"2026-07-19T16:17:11.633\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\niio: chemical: mhz19b: reject oversized serial replies\\n\\nmhz19b_receive_buf() appends each serdev chunk into the fixed\\nMHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without\\nchecking that the chunk fits in the remaining space. A large callback\\ncan therefore overflow st-\u003ebuf before the command path validates the\\nreply.\\n\\nReset the reply state before each command and reject oversized serial\\nreplies before copying them into the fixed buffer. When an oversized\\nreply is detected, wake the waiter and report -EMSGSIZE instead of\\noverwriting st-\u003ebuf.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/iio/chemical/mhz19b.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4572a70b3681e38055c78d12fb68cd147bdbee7d\",\"lessThan\":\"a5a05410cb34bfa486d63684cdc1f87a3b13f20a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4572a70b3681e38055c78d12fb68cd147bdbee7d\",\"lessThan\":\"ea69e7a6efa88ef32090a91064c362738cc19ddd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4572a70b3681e38055c78d12fb68cd147bdbee7d\",\"lessThan\":\"673478bc29cf72010faaf293c1c8c667393335a0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/iio/chemical/mhz19b.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"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/673478bc29cf72010faaf293c1c8c667393335a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.