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

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-06-14 18:01
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
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 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/149cfb42ad69c7964fd9f2c43831da9152007129"
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          "url": "https://git.kernel.org/stable/c/7b2d4c04816cdc887f472caaf7fc966cfc107e40"
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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",
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        "engine": "bippy-1.2.0"
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    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-06-14T18:01:09.675Z",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/bluetooth/virtio_bt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cf2719a21fdb9d4c8e9c834d279163609bef575d\",\"lessThan\":\"149cfb42ad69c7964fd9f2c43831da9152007129\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be\",\"lessThan\":\"7b2d4c04816cdc887f472caaf7fc966cfc107e40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be\",\"lessThan\":\"1e1e509b6fd2a42421745bbcd98bd16daad20904\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be\",\"lessThan\":\"2c1143564c71e7497b42d8360a8379ccbb011d3c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be\",\"lessThan\":\"3485c7236c59c8c34a41af1c4b52982437554e79\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be\",\"lessThan\":\"f743eab6486965f276c7e3f1700895f014fdc6db\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be\",\"lessThan\":\"daf23014e5d975e72ea9c02b5160d3fcf070ea47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b67438e315b925a699f0178f4a48baf3d2d6ef4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.78\",\"lessThan\":\"5.15.209\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.0.8\",\"lessThan\":\"6.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/bluetooth/virtio_bt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.78\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"9160A8B1-A21E-435E-8788-74986408D756\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.0.8\",\"versionEndExcluding\":\"6.1\",\"matchCriteriaId\":\"C49BA079-1891-4A21-B1A5-DB8C45CD20B6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.1\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"F8A015A3-130B-47F1-899B-AEDD0994D3D4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.7\",\"matchCriteriaId\":\"D0893CA7-9AE6-4DFE-AC75-48967D73AD8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE093B34-F4CD-4052-8122-730D6537A91A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"35B26BE4-43A6-4A36-A7F6-5B3F572D9186\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3FFFB0B3-930D-408A-91E2-BAE0C2715D80\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"8535320E-A0DB-4277-800E-D0CE5BBA59E8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"21718AA4-4056-40F2-968E-BDAA465A7872\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/149cfb42ad69c7964fd9f2c43831da9152007129\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1e1e509b6fd2a42421745bbcd98bd16daad20904\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2c1143564c71e7497b42d8360a8379ccbb011d3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3485c7236c59c8c34a41af1c4b52982437554e79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7b2d4c04816cdc887f472caaf7fc966cfc107e40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/daf23014e5d975e72ea9c02b5160d3fcf070ea47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f743eab6486965f276c7e3f1700895f014fdc6db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:41:22+00:00",
      "cve": "CVE-2026-46186",
      "id": "CVE-2026-46186",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: virtio_bt: validate rx pkt_type header length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46186.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:54:33Z",
      "cve": "CVE-2026-46186",
      "id": "CVE-2026-46186",
      "initial_release_date": "2026-05-29T01:15:33Z",
      "product_status:known_affected": "118",
      "product_status:known_not_affected": "118",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46186",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46186.json",
      "version": "5"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.