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CVE-2026-63956

Full vulnerability record from the local CVENow database.

Description

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
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-19 16:17:14.410000
Last modified
2026-10-30 14:32:20.473000
View original CVE JSON
{
  "id": "CVE-2026-63956",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-19T16:17:14.410",
  "lastModified": "2026-10-30T14:32:20.473",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "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."
    }
  ],
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      "affectedData": [
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          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/usb/serial/cypress_m8.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
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            },
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          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            },
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              "lessThanOrEqual": "6.1.*",
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            },
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              "version": "6.6.143",
              "lessThanOrEqual": "6.6.*",
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            },
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              "version": "6.12.93",
              "lessThanOrEqual": "6.12.*",
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            },
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              "version": "6.18.35",
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              "versionType": "original_commit_for_fix",
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          ]
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      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
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  ],
  "configurations": [
    {
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          "negate": false,
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}