Vulnerability-Lookup

GHSA-4M78-MJGQ-HQ8G

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:

USB: serial: cypress_m8: fix memory corruption with small endpoint

Make sure that the interrupt-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption or NULL-pointer dereference should a malicious device report a smaller size.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63956"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: cypress_m8: fix memory corruption with small endpoint\n\nMake sure that the interrupt-out endpoint max packet size is at least\neight bytes to avoid user-controlled slab corruption or NULL-pointer\ndereference should a malicious device report a smaller size.",
  "id": "GHSA-4m78-mjgq-hq8g",
  "modified": "2026-07-19T18:31:47Z",
  "published": "2026-07-19T18:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63956"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ef25704bd3b625fd151c09feee459479f71ee64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/284105c40fc31fff90cdab8a0377aaeb92f87f0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bcaa59f403dbde6328604a500d65ee8d40975d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fcb22218f0a7229b7ce3b3952fb644def293fa5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52e18ae0c47c5c89e18fcd8022f287f7cc8802ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c13f3bb652bc8665e709ba07122612586aea648"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad3d1628a46134276546d7a12fedf04be9979158"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1a9d791fd66ab2431b9e6f6f835823809869047"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-63956 (GCVE-0-2026-63956)

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

Title

USB: serial: cypress_m8: fix memory corruption with small endpoint

Summary

In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: fix memory corruption with small endpoint Make sure that the interrupt-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption or NULL-pointer dereference should a malicious device report a smaller size.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/4fcb22218f0a7229b…
https://git.kernel.org/stable/c/ad3d1628a46134276…
https://git.kernel.org/stable/c/52e18ae0c47c5c89e…
https://git.kernel.org/stable/c/4bcaa59f403dbde63…
https://git.kernel.org/stable/c/1ef25704bd3b625fd…
https://git.kernel.org/stable/c/284105c40fc31fff9…
https://git.kernel.org/stable/c/6c13f3bb652bc8665…
https://git.kernel.org/stable/c/e1a9d791fd66ab243…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 4fcb22218f0a7229b7ce3b3952fb644def293fa5 (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < ad3d1628a46134276546d7a12fedf04be9979158 (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 52e18ae0c47c5c89e18fcd8022f287f7cc8802ec (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 4bcaa59f403dbde6328604a500d65ee8d40975d9 (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 1ef25704bd3b625fd151c09feee459479f71ee64 (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 284105c40fc31fff90cdab8a0377aaeb92f87f0e (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 6c13f3bb652bc8665e709ba07122612586aea648 (git) Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < e1a9d791fd66ab2431b9e6f6f835823809869047 (git)
Linux	Linux	Affected: 2.6.26 Unaffected: 0 , < 2.6.26 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (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/usb/serial/cypress_m8.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          ]
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          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.26"
            },
            {
              "lessThan": "2.6.26",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
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              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "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": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
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                },
                {
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: cypress_m8: fix memory corruption with small endpoint\n\nMake sure that the interrupt-out endpoint max packet size is at least\neight bytes to avoid user-controlled slab corruption or NULL-pointer\ndereference should a malicious device report a smaller size."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:47.597Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-07-19T14:55:47.597Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-07-19T14:55:47.597Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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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-4M78-MJGQ-HQ8G

CVE-2026-63956 (GCVE-0-2026-63956)

Tags

Sightings

Nomenclature