CVE-2026-46186 (GCVE-0-2026-46186)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-06-01 16:19
VLAI
Title
Bluetooth: virtio_bt: validate rx pkt_type header length
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: validate rx pkt_type header length virtbt_rx_handle() reads the leading pkt_type byte from the RX skb and forwards the remainder to hci_recv_frame() for every event/ACL/SCO/ISO type, without checking that the remaining payload is at least the fixed HCI header for that type. After the preceding patch bounds the backend-supplied used.len to [1, VIRTBT_RX_BUF_SIZE], a one-byte completion still reaches hci_recv_frame() with skb->len already pulled to 0. If the byte happened to be HCI_ACLDATA_PKT, the ACL-vs-ISO classification fast-path in hci_dev_classify_pkt_type() dereferences hci_acl_hdr(skb)->handle whenever the HCI device has an active CIS_LINK, BIS_LINK, or PA_LINK connection, reading two bytes of uninitialized RX-buffer data. The same hazard exists for every packet type the driver accepts because none of the switch cases in virtbt_rx_handle() check skb->len against the per-type minimum HCI header size before handing the frame to the core. After stripping pkt_type, require skb->len to cover the fixed header size for the selected type (event 2, ACL 4, SCO 3, ISO 4) before calling hci_recv_frame(); drop ratelimited otherwise. Unknown pkt_type values still take the original kfree_skb() default path. Use bt_dev_err_ratelimited() because both the length and pkt_type values come from an untrusted backend that can otherwise flood the kernel log.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: cf2719a21fdb9d4c8e9c834d279163609bef575d , < 149cfb42ad69c7964fd9f2c43831da9152007129 (git)
Affected: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be , < 7b2d4c04816cdc887f472caaf7fc966cfc107e40 (git)
Affected: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be , < 1e1e509b6fd2a42421745bbcd98bd16daad20904 (git)
Affected: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be , < 2c1143564c71e7497b42d8360a8379ccbb011d3c (git)
Affected: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be , < 3485c7236c59c8c34a41af1c4b52982437554e79 (git)
Affected: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be , < f743eab6486965f276c7e3f1700895f014fdc6db (git)
Affected: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be , < daf23014e5d975e72ea9c02b5160d3fcf070ea47 (git)
Affected: 9b67438e315b925a699f0178f4a48baf3d2d6ef4 (git)
Affected: 5.15.78 , < 5.15.209 (semver)
Affected: 6.0.8 , < 6.1 (semver)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)
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Show details on NVD website

{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: virtio_bt: validate rx pkt_type header length\n\nvirtbt_rx_handle() reads the leading pkt_type byte from the RX skb\nand forwards the remainder to hci_recv_frame() for every\nevent/ACL/SCO/ISO type, without checking that the remaining payload\nis at least the fixed HCI header for that type.\n\nAfter the preceding patch bounds the backend-supplied used.len to\n[1, VIRTBT_RX_BUF_SIZE], a one-byte completion still reaches\nhci_recv_frame() with skb-\u003elen already pulled to 0. If the byte\nhappened to be HCI_ACLDATA_PKT, the ACL-vs-ISO classification\nfast-path in hci_dev_classify_pkt_type() dereferences\nhci_acl_hdr(skb)-\u003ehandle whenever the HCI device has an active\nCIS_LINK, BIS_LINK, or PA_LINK connection, reading two bytes of\nuninitialized RX-buffer data. The same hazard exists for every\npacket type the driver accepts because none of the switch cases in\nvirtbt_rx_handle() check skb-\u003elen against the per-type minimum HCI\nheader size before handing the frame to the core.\n\nAfter stripping pkt_type, require skb-\u003elen to cover the fixed\nheader size for the selected type (event 2, ACL 4, SCO 3, ISO 4)\nbefore calling hci_recv_frame(); drop ratelimited otherwise.\nUnknown pkt_type values still take the original kfree_skb() default\npath.\n\nUse bt_dev_err_ratelimited() because both the length and pkt_type\nvalues come from an untrusted backend that can otherwise flood the\nkernel log."
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      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:19:46.227Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/daf23014e5d975e72ea9c02b5160d3fcf070ea47"
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      ],
      "title": "Bluetooth: virtio_bt: validate rx pkt_type header length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "cveId": "CVE-2026-46186",
    "datePublished": "2026-05-28T09:36:40.349Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-06-01T16:19:46.227Z",
    "state": "PUBLISHED"
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  }
}


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