{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "7c15c7c2878957cbfed93bcc29c13fdace464254"
            },
            {
              "fixed": "0d637136ce89f9a2309b2c3502402ce400dab0ef"
            },
            {
              "fixed": "98377e6b1a1a56561ec66a181573ea2b61b2079e"
            },
            {
              "fixed": "1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c"
            },
            {
              "fixed": "3eabc6d47a0ad22b053329997aaf0ec1e581e392"
            },
            {
              "fixed": "08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997"
            },
            {
              "fixed": "23882b828c3c8c51d0c946446a396b10abb3b16b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53254.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: validate skb length in MCC handlers\n\nThe RFCOMM MCC handlers cast skb-\u003edata to protocol-specific structs\nwithout validating skb-\u003elen first. A malicious remote device can send\ntruncated MCC frames and trigger out-of-bounds reads in these handlers.\n\nFix this by using skb_pull_data() to validate and access the required\ndata before dereferencing it.\n\nrfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows\n1-byte RPN requests. Handle this by validating only the DLCI byte first,\nand validating the full struct only when len \u003e 1.",
  "id": "CVE-2026-53254",
  "modified": "2026-07-10T03:54:42.142014785Z",
  "published": "2026-06-25T08:39:45.273Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53254.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53254"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bluetooth: RFCOMM: validate skb length in MCC handlers"
}