CVE-2023-53840 (GCVE-0-2023-53840)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2026-05-11 19:52
VLAI
Title
usb: early: xhci-dbc: Fix a potential out-of-bound memory access
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: early: xhci-dbc: Fix a potential out-of-bound memory access If xdbc_bulk_write() fails, the values in 'buf' can be anything. So the string is not guaranteed to be NULL terminated when xdbc_trace() is called. Reserve an extra byte, which will be zeroed automatically because 'buf' is a static variable, in order to avoid troubles, should it happen.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 , < e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0 (git)
Affected: aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 , < 351c8d8650d1ccc006255fa01f98b6c6496a02e5 (git)
Affected: aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 , < df7c8aba7309f4dc55df94e06b67f576c0f52406 (git)
Affected: aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 , < a4a97ab3db5c081eb6e7dba91306adefb461e0bd (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.15.99 , ≤ 5.15.* (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/early/xhci-dbc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            },
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                },
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                },
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                  "versionEndExcluding": "6.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: early: xhci-dbc: Fix a potential out-of-bound memory access\n\nIf xdbc_bulk_write() fails, the values in \u0027buf\u0027 can be anything. So the\nstring is not guaranteed to be NULL terminated when xdbc_trace() is called.\n\nReserve an extra byte, which will be zeroed automatically because \u0027buf\u0027 is\na static variable, in order to avoid troubles, should it happen."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:52:32.046Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/a4a97ab3db5c081eb6e7dba91306adefb461e0bd"
        }
      ],
      "title": "usb: early: xhci-dbc: Fix a potential out-of-bound memory access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53840",
    "datePublished": "2025-12-09T01:29:56.848Z",
    "dateReserved": "2025-12-09T01:27:17.826Z",
    "dateUpdated": "2026-05-11T19:52:32.046Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53840",
      "date": "2026-10-23",
      "epss": "0.00244",
      "percentile": "0.14751"
    },
    "nvd": {
      "cve": {
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          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/usb/early/xhci-dbc.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                  },
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: early: xhci-dbc: Fix a potential out-of-bound memory access\n\nIf xdbc_bulk_write() fails, the values in \u0027buf\u0027 can be anything. So the\nstring is not guaranteed to be NULL terminated when xdbc_trace() is called.\n\nReserve an extra byte, which will be zeroed automatically because \u0027buf\u0027 is\na static variable, in order to avoid troubles, should it happen."
          }
        ],
        "id": "CVE-2023-53840",
        "lastModified": "2026-06-17T06:46:09.820",
        "metrics": {},
        "published": "2025-12-09T16:17:23.667",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/351c8d8650d1ccc006255fa01f98b6c6496a02e5"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T22:38:34+00:00",
      "cve": "CVE-2023-53840",
      "id": "CVE-2023-53840",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: early: xhci-dbc: Fix a potential out-of-bound memory access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53840.json",
      "version": "3"
    }
  }
}



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