Vulnerability-Lookup

GHSA-VRPQ-2GCP-G727

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63932"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:11Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-vrpq-2gcp-g727",
  "modified": "2026-07-19T18:31:46Z",
  "published": "2026-07-19T18:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63932"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55

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

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/a5a05410cb34bfa48…
https://git.kernel.org/stable/c/ea69e7a6efa88ef32…
https://git.kernel.org/stable/c/673478bc29cf72010…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4572a70b3681e38055c78d12fb68cd147bdbee7d , < a5a05410cb34bfa486d63684cdc1f87a3b13f20a (git) Affected: 4572a70b3681e38055c78d12fb68cd147bdbee7d , < ea69e7a6efa88ef32090a91064c362738cc19ddd (git) Affected: 4572a70b3681e38055c78d12fb68cd147bdbee7d , < 673478bc29cf72010faaf293c1c8c667393335a0 (git)
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)

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{
  "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": [
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            },
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              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            }
          ]
        },
        {
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          "programFiles": [
            "drivers/iio/chemical/mhz19b.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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            },
            {
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              "version": "7.0.12",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
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                },
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                  "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"
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        {
          "url": "https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd"
        },
        {
          "url": "https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0"
        }
      ],
      "title": "iio: chemical: mhz19b: reject oversized serial replies",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "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"
  },
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}

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.

Action not permitted

GHSA-VRPQ-2GCP-G727

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

Tags

Sightings

Nomenclature