CVE-2026-97408 (GCVE-0-2026-97408)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:03 – Updated: 2026-10-03 10:58
VLAI
Title
Bluetooth: L2CAP: validate connectionless PSM length
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate connectionless PSM length Connectionless L2CAP frames carry a two-byte PSM at the start of the payload. l2cap_recv_frame() currently reads that PSM unconditionally after validating only the outer L2CAP length. A malformed connectionless frame with a zero- or one-byte payload can therefore make the parser read beyond the advertised skb payload and use tailroom bytes as part of the PSM. A VHCI-backed QEMU reproducer injected a one-byte connectionless payload and reached the unchecked read. Reject connectionless frames that cannot contain the PSM before reading or pulling it. This preserves all valid connectionless frames while dropping only structurally incomplete packets.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8104cd9859b6de0826cffa68adf2c1461185823b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 22fc1ce4e37c81d4e7aac01566ebdc232214540d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 72e26293a231f63a856340d3a1f0f5fc29bf87e5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3502ede8aed3c3ee1786d952a11054ac737d1a38 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ae69dca122f6d6046a68cf40153e6e827c77ff5c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a40a5f922546b3bd7c094d882b29177db4f2abe0 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate connectionless PSM length\n\nConnectionless L2CAP frames carry a two-byte PSM at the start of the\npayload.  l2cap_recv_frame() currently reads that PSM unconditionally\nafter validating only the outer L2CAP length.\n\nA malformed connectionless frame with a zero- or one-byte payload can\ntherefore make the parser read beyond the advertised skb payload and use\ntailroom bytes as part of the PSM.  A VHCI-backed QEMU reproducer\ninjected a one-byte connectionless payload and reached the unchecked\nread.\n\nReject connectionless frames that cannot contain the PSM before reading\nor pulling it.  This preserves all valid connectionless frames while\ndropping only structurally incomplete packets."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:58:02.384Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8104cd9859b6de0826cffa68adf2c1461185823b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982"
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          "url": "https://git.kernel.org/stable/c/22fc1ce4e37c81d4e7aac01566ebdc232214540d"
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          "url": "https://git.kernel.org/stable/c/72e26293a231f63a856340d3a1f0f5fc29bf87e5"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a40a5f922546b3bd7c094d882b29177db4f2abe0"
        }
      ],
      "title": "Bluetooth: L2CAP: validate connectionless PSM length",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97408",
    "datePublished": "2026-09-24T16:03:15.141Z",
    "dateReserved": "2026-09-24T14:53:16.866Z",
    "dateUpdated": "2026-10-03T10:58:02.384Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-21",
      "epss": "0.00173",
      "percentile": "0.06325"
    },
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      "cve": "CVE-2026-97408",
      "id": "msrc_CVE-2026-97408",
      "initial_release_date": "2026-09-28T03:01:52.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: L2CAP: validate connectionless PSM length",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97408.json",
      "version": "5"
    },
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate connectionless PSM length\n\nConnectionless L2CAP frames carry a two-byte PSM at the start of the\npayload.  l2cap_recv_frame() currently reads that PSM unconditionally\nafter validating only the outer L2CAP length.\n\nA malformed connectionless frame with a zero- or one-byte payload can\ntherefore make the parser read beyond the advertised skb payload and use\ntailroom bytes as part of the PSM.  A VHCI-backed QEMU reproducer\ninjected a one-byte connectionless payload and reached the unchecked\nread.\n\nReject connectionless frames that cannot contain the PSM before reading\nor pulling it.  This preserves all valid connectionless frames while\ndropping only structurally incomplete packets."
          }
        ],
        "id": "CVE-2026-97408",
        "lastModified": "2026-10-03T11:17:52.943",
        "metrics": {},
        "published": "2026-09-24T17:17:18.337",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T21:39:13+00:00",
      "cve": "CVE-2026-97408",
      "id": "CVE-2026-97408",
      "initial_release_date": "2026-09-24T00:00:00+00:00",
      "product_status:known_affected": "263",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: validate connectionless PSM length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97408.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-25T23:47:54Z",
      "cve": "CVE-2026-97408",
      "id": "CVE-2026-97408",
      "initial_release_date": "2026-09-25T23:47:54Z",
      "product_status:known_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97408",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-97408.json",
      "version": "2"
    }
  }
}



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