{"id":"CVE-2026-46186","state":"PUBLISHED","title":"Bluetooth: virtio_bt: validate rx pkt_type header length","description":"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->len 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)->handle 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->len against the per-type minimum HCI\nheader size before handing the frame to the core.\n\nAfter stripping pkt_type, require skb->len 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.","publishedAt":"2026-05-28T09:36:40.349Z","updatedAt":"2026-06-14T18:01:09.675Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf2719a21fdb9d4c8e9c834d279163609bef575d","status":"affected","lessThan":"149cfb42ad69c7964fd9f2c43831da9152007129","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"7b2d4c04816cdc887f472caaf7fc966cfc107e40","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"1e1e509b6fd2a42421745bbcd98bd16daad20904","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"2c1143564c71e7497b42d8360a8379ccbb011d3c","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"3485c7236c59c8c34a41af1c4b52982437554e79","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"f743eab6486965f276c7e3f1700895f014fdc6db","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"daf23014e5d975e72ea9c02b5160d3fcf070ea47","versionType":"git"},{"version":"9b67438e315b925a699f0178f4a48baf3d2d6ef4","status":"affected","versionType":"git"},{"version":"5.15.78","status":"affected","lessThan":"5.15.209","versionType":"semver"},{"version":"6.0.8","status":"affected","lessThan":"6.1","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/virtio_bt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/virtio_bt.c"]}],"references":["https://git.kernel.org/stable/c/149cfb42ad69c7964fd9f2c43831da9152007129","https://git.kernel.org/stable/c/7b2d4c04816cdc887f472caaf7fc966cfc107e40","https://git.kernel.org/stable/c/1e1e509b6fd2a42421745bbcd98bd16daad20904","https://git.kernel.org/stable/c/2c1143564c71e7497b42d8360a8379ccbb011d3c","https://git.kernel.org/stable/c/3485c7236c59c8c34a41af1c4b52982437554e79","https://git.kernel.org/stable/c/f743eab6486965f276c7e3f1700895f014fdc6db","https://git.kernel.org/stable/c/daf23014e5d975e72ea9c02b5160d3fcf070ea47"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46186.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46186","state":"PUBLISHED","datePublished":"2026-05-28T09:36:40.349Z","dateUpdated":"2026-06-14T18:01:09.675Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.103Z"},"containers":{"cna":{"title":"Bluetooth: virtio_bt: validate rx pkt_type header length","descriptions":[{"lang":"en","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->len 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)->handle 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->len against the per-type minimum HCI\nheader size before handing the frame to the core.\n\nAfter stripping pkt_type, require skb->len 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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf2719a21fdb9d4c8e9c834d279163609bef575d","status":"affected","lessThan":"149cfb42ad69c7964fd9f2c43831da9152007129","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"7b2d4c04816cdc887f472caaf7fc966cfc107e40","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"1e1e509b6fd2a42421745bbcd98bd16daad20904","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"2c1143564c71e7497b42d8360a8379ccbb011d3c","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"3485c7236c59c8c34a41af1c4b52982437554e79","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"f743eab6486965f276c7e3f1700895f014fdc6db","versionType":"git"},{"version":"160fbcf3bfb93c3c086427f9f4c8bc70f217e9be","status":"affected","lessThan":"daf23014e5d975e72ea9c02b5160d3fcf070ea47","versionType":"git"},{"version":"9b67438e315b925a699f0178f4a48baf3d2d6ef4","status":"affected","versionType":"git"},{"version":"5.15.78","status":"affected","lessThan":"5.15.209","versionType":"semver"},{"version":"6.0.8","status":"affected","lessThan":"6.1","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/virtio_bt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/virtio_bt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/149cfb42ad69c7964fd9f2c43831da9152007129"},{"url":"https://git.kernel.org/stable/c/7b2d4c04816cdc887f472caaf7fc966cfc107e40"},{"url":"https://git.kernel.org/stable/c/1e1e509b6fd2a42421745bbcd98bd16daad20904"},{"url":"https://git.kernel.org/stable/c/2c1143564c71e7497b42d8360a8379ccbb011d3c"},{"url":"https://git.kernel.org/stable/c/3485c7236c59c8c34a41af1c4b52982437554e79"},{"url":"https://git.kernel.org/stable/c/f743eab6486965f276c7e3f1700895f014fdc6db"},{"url":"https://git.kernel.org/stable/c/daf23014e5d975e72ea9c02b5160d3fcf070ea47"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T18:01:09.675Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.78","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}