{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90089", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.786Z", "datePublished": "2026-09-17T16:06:04.201Z", "dateUpdated": "2026-10-19T08:57:47.078Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:57:47.078Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/btnxpuart.c" ], "versions": [ { "version": "998e447f443f138c90faa6ff3845082af419070e", "lessThan": "a644b8df94966b672ac656577df98bd01bc88393", "status": "affected", "versionType": "git" }, { "version": "998e447f443f138c90faa6ff3845082af419070e", "lessThan": "22d419db7f9a01bea22cfcf66774d2b2fd4bb354", "status": "affected", "versionType": "git" }, { "version": "998e447f443f138c90faa6ff3845082af419070e", "lessThan": "060fa7592bdc043a93b6b7870f5b8551206d315d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/btnxpuart.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a644b8df94966b672ac656577df98bd01bc88393" }, { "url": "https://git.kernel.org/stable/c/22d419db7f9a01bea22cfcf66774d2b2fd4bb354" }, { "url": "https://git.kernel.org/stable/c/060fa7592bdc043a93b6b7870f5b8551206d315d" } ], "title": "Bluetooth: btnxpuart: Validate the FW dump header length", "x_generator": { "engine": "bippy-1.2.0" } } } }