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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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "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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        "dateUpdated": "2026-08-23T12:47:28.838Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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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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    "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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      "cve": "CVE-2026-74508",
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      "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": "1"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hidp/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"238c333bc4b3f245c626632e8bfa3c9dab97f51b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"567a2a0a633f2ea5fdccaf3517c09f22c9d860c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"97b61241ab45bfa5b0526cb0f3978942493bc811\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"2ebf63aa557a69990b4e9ea22be224d58aabce96\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"854194494a6f726a60b90b76059148bf08df023d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"47778d2c2087b5d192398f6fddf692d16a5431cf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hidp/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.