159 lines
9.4 KiB
JSON
159 lines
9.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90089",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.786Z",
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"datePublished": "2026-09-17T16:06:04.201Z",
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"dateUpdated": "2026-10-19T08:57:47.078Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:57:47.078Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btnxpuart: Validate the FW dump header length\n\nnxp_process_fw_dump() pulls the ACL header off the frame and then reads\nseq_num and buf_len from a struct nxp_fw_dump_hdr placed at skb->data,\nwithout checking that the ACL payload is long enough to contain it.\n\nh4_recv_buf() collects HCI_ACL_HDR_SIZE bytes of header followed by the\nnumber of payload bytes named in that header, so skb->len is 4 + dlen\nwith dlen supplied by the controller and possibly smaller than the 8\nbyte dump header, or zero. A short frame with connection handle 0xfff\ntherefore reads both fields from beyond the received data.\n\nBeyond the read itself, buf_len is what terminates a dump: a value of\nzero makes the driver call hci_devcd_complete() and reset the\ncontroller, so a truncated frame can end a dump early.\n\nUse skb_pull_data() to validate and pull the FW dump header before\naccessing its fields. Warn and reject the chunk if the header is\ntruncated."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:A - The malformed nxp_fw_dump_hdr is taken from HCI ACL frames with connection handle 0xFFF. Those frames are assembled by h4_recv_buf() from UART bytes in btnxpuart_receive_buf() and dispatched by nxp_recv_acl_pkt() into nxp_process_fw_dump(). A nearby attacker who induces an NXP firmware dump over the air supplies that ACL dump chunk; Bluetooth range is Adjacent.\nAC:L - nxp_process_fw_dump() loads seq_num and buf_len after skb_pull_data() of only the 4-byte HCI ACL header. h4_recv_buf() delivers any dlen the controller advertised, including zero, so one handle-0xFFF ACL with dlen<8 deterministically over-reads with no race or uninfluenced layout.\nPR:N - nxp_recv_acl_pkt() and nxp_process_fw_dump() run on the serdev RX path with no pairing, HCI authentication, or capability check; handle 0xFFF dump chunks are consumed before they reach the normal HCI ACL stack.\nUI:N - btnxpuart_receive_buf() always passes complete H4 ACL frames to nxp_recv_acl_pkt(); no user must pair, confirm a prompt, or write the HCI coredump sysfs entry for a dump chunk to be parsed.\nS:U - The over-read, hci_devcd_init/append/complete dump state, and nxp_set_ind_reset() controller reset all stay in the host kernel's btnxpuart/HCI authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:L - After pulling the ACL header, the driver loads the 8-byte nxp_fw_dump_hdr (seq_num and buf_len) from skb->data even when skb->len is 0–7. That is a strictly bounded 8-byte over-read of the H4 ACL skb tailroom allocated at HCI_MAX_FRAME_SIZE, and those fields are never copied to userspace.\nI:N - The path only reads seq_num/buf_len to decide dump start/complete and does not write past the skb; hci_devcd_append() copies only skb->len valid bytes, so there is no OOB write or control-flow hijack primitive.\nA:H - When the over-read buf_len is 0, nxp_process_fw_dump() calls hci_devcd_complete() and nxp_set_ind_reset(), which injects HCI_EV_HARDWARE_ERROR 0xb0 (BTNXPUART_IR_HW_ERR) and runs the independent-reset path (nxp_hw_err → HCI_NXP_IND_RESET), taking the Bluetooth controller down; a truncated handle-0xFFF frame can repeat this at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/bluetooth/btnxpuart.c"
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],
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"versions": [
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{
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"version": "998e447f443f138c90faa6ff3845082af419070e",
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"lessThan": "a644b8df94966b672ac656577df98bd01bc88393",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "998e447f443f138c90faa6ff3845082af419070e",
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"lessThan": "22d419db7f9a01bea22cfcf66774d2b2fd4bb354",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "998e447f443f138c90faa6ff3845082af419070e",
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"lessThan": "060fa7592bdc043a93b6b7870f5b8551206d315d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/bluetooth/btnxpuart.c"
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],
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"versions": [
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{
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"version": "6.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.52"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a644b8df94966b672ac656577df98bd01bc88393"
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},
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{
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"url": "https://git.kernel.org/stable/c/22d419db7f9a01bea22cfcf66774d2b2fd4bb354"
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},
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{
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"url": "https://git.kernel.org/stable/c/060fa7592bdc043a93b6b7870f5b8551206d315d"
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}
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],
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"title": "Bluetooth: btnxpuart: Validate the FW dump header length",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |