CVE-2026-74508 (GCVE-0-2026-74508)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47
VLAI
Title
Bluetooth: HIDP: reject frames without a transaction header
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: reject frames without a transaction header hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty basic-mode SDU and make both paths use an uninitialized byte from skb tailroom. KMSAN reports the use in hidp_session_run(), with the uninitialized value originating in __alloc_skb() through vhci_write(). The control path produces two reports and the interrupt path produces one. The byte can also be controlled by a malformed lower-layer packet. If an HCI ACL packet contains an L2CAP PDU with a declared zero-length payload followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to the declared PDU length before dispatch. The current HIDP path nevertheless consumes the extra byte as HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this change, the same packet is discarded and a subsequent feature report request succeeds. Pull the transaction header with skb_pull_data() and discard frames that do not contain it.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 238c333bc4b3f245c626632e8bfa3c9dab97f51b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 97b61241ab45bfa5b0526cb0f3978942493bc811 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2ebf63aa557a69990b4e9ea22be224d58aabce96 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 854194494a6f726a60b90b76059148bf08df023d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 47778d2c2087b5d192398f6fddf692d16a5431cf (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: reject frames without a transaction header\n\nhidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb-\u003edata[0]\nbefore checking that the L2CAP SDU contains a transaction header. A\nconnected HIDP peer can send an empty basic-mode SDU and make both paths\nuse an uninitialized byte from skb tailroom.\n\nKMSAN reports the use in hidp_session_run(), with the uninitialized value\noriginating in __alloc_skb() through vhci_write(). The control path\nproduces two reports and the interrupt path produces one.\n\nThe byte can also be controlled by a malformed lower-layer packet. If an\nHCI ACL packet contains an L2CAP PDU with a declared zero-length payload\nfollowed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb-\u003elen to\nthe declared PDU length before dispatch. The current HIDP path nevertheless\nconsumes the extra byte as HIDP_TRANS_HID_CONTROL |\nHIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this\nchange, the same packet is discarded and a subsequent feature report\nrequest succeeds.\n\nPull the transaction header with skb_pull_data() and discard frames that\ndo not contain it."
        }
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        {
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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          "scenarios": [
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              "value": "AV:A - Malicious or malformed Bluetooth L2CAP SDUs reach hidp_recv_ctrl_frame()/hidp_recv_intr_frame() from a radio-adjacent peer via hci_acl_packet() -\u003e l2cap_recv_acldata() -\u003e l2cap_recv_frame() -\u003e l2cap_sock_recv_cb() -\u003e hidp_session_run().\nAC:L - A connected HIDP peer reliably triggers the bug by sending empty basic-mode SDUs or zero-length L2CAP PDUs with trailing bytes; the attacker controls both sides of the malformed-packet condition without races or rare kernel configs.\nPR:N - Exploitation requires only delivering crafted Bluetooth ACL/L2CAP traffic as the connected peer; the victim attacker does not need local accounts, capabilities, or CAP_NET_ADMIN on the target host.\nUI:N - Once a normal Bluetooth HID session is active (typical paired keyboard/mouse/headset use), the attacker can send malicious frames without any additional victim interaction during exploitation.\nS:U - The flaw affects kernel Bluetooth HIDP session handling only and does not cross VM, container, or IOMMU security boundaries; impact stays within the kernel Bluetooth/HID authority.\nC:H - On zero-length SDUs, hidp_recv_*_frame() reads skb-\u003edata[0] from uninitialized skb tailroom (KMSAN via vhci_write/__alloc_skb), leaking kernel heap bytes that drive subsequent protocol parsing.\nI:H - Attacker-controlled header bytes (e.g., malformed PDU trailing 0x15 = HIDP_TRANS_HID_CONTROL|HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) force hidp_process_hid_control() to tear down sessions and can misroute other transaction types through handshake/data handlers.\nA:H - Forged virtual-cable-unplug and related control-path handling forcibly terminates active HIDP sessions, completely denying Bluetooth HID input/output on phones, laptops, kiosks, and embedded systems until reconnect."
            }
          ]
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        {
          "url": "https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf"
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      ],
      "title": "Bluetooth: HIDP: reject frames without a transaction header",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74508",
    "datePublished": "2026-08-15T12:27:31.288Z",
    "dateReserved": "2026-08-15T05:44:03.908Z",
    "dateUpdated": "2026-08-23T12:47:28.838Z",
    "state": "PUBLISHED"
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      "date": "2026-09-22",
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      "percentile": "0.18359"
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    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:55:56.000Z",
      "cve": "CVE-2026-74508",
      "id": "msrc_CVE-2026-74508",
      "initial_release_date": "2026-08-23T15:01:06.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: HIDP: reject frames without a transaction header",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74508.json",
      "version": "3"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: reject frames without a transaction header\n\nhidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb-\u003edata[0]\nbefore checking that the L2CAP SDU contains a transaction header. A\nconnected HIDP peer can send an empty basic-mode SDU and make both paths\nuse an uninitialized byte from skb tailroom.\n\nKMSAN reports the use in hidp_session_run(), with the uninitialized value\noriginating in __alloc_skb() through vhci_write(). The control path\nproduces two reports and the interrupt path produces one.\n\nThe byte can also be controlled by a malformed lower-layer packet. If an\nHCI ACL packet contains an L2CAP PDU with a declared zero-length payload\nfollowed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb-\u003elen to\nthe declared PDU length before dispatch. The current HIDP path nevertheless\nconsumes the extra byte as HIDP_TRANS_HID_CONTROL |\nHIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this\nchange, the same packet is discarded and a subsequent feature report\nrequest succeeds.\n\nPull the transaction header with skb_pull_data() and discard frames that\ndo not contain it."
          }
        ],
        "id": "CVE-2026-74508",
        "lastModified": "2026-08-23T13:16:44.990",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T13:17:55.843",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b"
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            "url": "https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/567a2a0a633f2ea5fdccaf3517c09f22c9d860c7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:55:51+00:00",
      "cve": "CVE-2026-74508",
      "id": "CVE-2026-74508",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: HIDP: reject frames without a transaction header",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74508.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:19:53Z",
      "cve": "CVE-2026-74508",
      "id": "CVE-2026-74508",
      "initial_release_date": "2026-09-02T01:04:28Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "93",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74508",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74508.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.