CVE-2026-63947

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If a paired device sends a truncated packet,\nthe handler reads beyond the valid skb data, resulting in an\nout-of-bounds read of skb data. The OOB bytes may be interpreted as\nphantom key presses or spurious mouse movement.\n\nReplace the open-coded length tracking and pointer arithmetic with\nskb_pull_data() calls. skb_pull_data() returns NULL if the requested\nbytes are not present, eliminating the need for a manual size variable\nand the separate skb->len guard."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The bug is reached when a connected Bluetooth HID peer sends malformed HIDP interrupt (or control DATA) frames over L2CAP ACL; packets traverse HCI \u2192 l2cap_recv_acldata() \u2192 l2cap_data_channel() \u2192 l2cap_sock_recv_cb() \u2192 HIDP session thread \u2192 hidp_recv_intr_frame()/hidp_process_data() \u2192 hidp_input_report(), which is an adjacent Bluetooth attack surface.\nAC:L - Exploitation only requires sending deliberately truncated HIDP input reports on an already-established HIDP/L2CAP session; the attacker fully controls packet length and can trigger the out-of-bounds read reliably on every malformed frame with no race or special memory layout.\nPR:N - The attacker is an external Bluetooth HID device sending L2CAP payloads and needs no Linux account, capability, or namespace privilege; CAP_NET_ADMIN is only required for bluetoothd to register the session, not for the malicious peer to deliver the crafted packets.\nUI:N - Once a HIDP session is active, exploitation is automatic from crafted Bluetooth traffic and requires no further victim action; pairing/connection is an attacker prerequisite, not user interaction at exploit time (consistent with prior Bluetooth HIDP CNA scoring such as CVE-2026-23462).\nS:U - Impact is confined to kernel HIDP/input handling and forged input events delivered within the same kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The vulnerable code performs out-of-bounds reads of up to eight keyboard or four mouse payload bytes beyond skb->len, and per CVSS kernel guidance any out-of-bounds read is rated High because adjacent skb tailroom may contain stale packet or kernel heap data observable through phantom key/mouse event side channels.\nI:H - Out-of-bounds bytes are interpreted as boot-protocol keyboard scancodes and mouse button/movement events, enabling phantom key presses and pointer injection into the system input layer; on laptops, kiosks, automotive consoles, and Android handsets this can forge arbitrary keystrokes/clicks against the active user session.\nA:H - Reading keyboard/mouse payload bytes past valid skb->len is undefined behavior on tightly allocated skbs with no tailroom and can fault the kernel; even when reads stay within tailroom, forged input can repeatedly disrupt session availability on shared/public Bluetooth keyboard deployments, and under the conservative scoring rule this is rated High when crash potential cannot be excluded."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hidp/core.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1f08a90013e1e632b34321334e861fcefc056505", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cc3832b19f863e3677c5651f001a2e3795f39eb8", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d313683d6ccdd8c01e0562270a2ae25b86d8461d", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d7d6a81b8dd1a8d084a1b755db9406041d53adb5", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6348dfed5b0f9c6074f14322332e97493d32fef0", "status": 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"https://git.kernel.org/stable/c/6348dfed5b0f9c6074f14322332e97493d32fef0"}, {"url": "https://git.kernel.org/stable/c/b83dcacd2ec7fcc5a48be215f82d573759f87ec2"}, {"url": "https://git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6"}], "title": "Bluetooth: HIDP: fix missing length checks in hidp_input_report()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63947", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:34:08.064493Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:17:58.868Z"}}]}}

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the attacker fully controls packet length and can trigger the out-of-bounds read reliably on every malformed frame with no race or special memory layout.\nPR:N - The attacker is an external Bluetooth HID device sending L2CAP payloads and needs no Linux account, capability, or namespace privilege; CAP_NET_ADMIN is only required for bluetoothd to register the session, not for the malicious peer to deliver the crafted packets.\nUI:N - Once a HIDP session is active, exploitation is automatic from crafted Bluetooth traffic and requires no further victim action; pairing/connection is an attacker prerequisite, not user interaction at exploit time (consistent with prior Bluetooth HIDP CNA scoring such as CVE-2026-23462).\nS:U - Impact is confined to kernel HIDP/input handling and forged input events delivered within the same kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The vulnerable code performs out-of-bounds reads of up to eight keyboard or four mouse payload bytes beyond skb->len, and per CVSS kernel guidance any out-of-bounds read is rated High because adjacent skb tailroom may contain stale packet or kernel heap data observable through phantom key/mouse event side channels.\nI:H - Out-of-bounds bytes are interpreted as boot-protocol keyboard scancodes and mouse button/movement events, enabling phantom key presses and pointer injection into the system input layer; on laptops, kiosks, automotive consoles, and Android handsets this can forge arbitrary keystrokes/clicks against the active user session.\nA:H - Reading keyboard/mouse payload bytes past valid skb->len is undefined behavior on tightly allocated skbs with no tailroom and can fault the kernel; even when reads stay within tailroom, forged input can repeatedly disrupt session availability on shared/public Bluetooth keyboard deployments, and under the conservative scoring rule this is rated High when crash potential cannot be excluded."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1f08a90013e1e632b34321334e861fcefc056505", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cc3832b19f863e3677c5651f001a2e3795f39eb8", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d313683d6ccdd8c01e0562270a2ae25b86d8461d", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d7d6a81b8dd1a8d084a1b755db9406041d53adb5", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6348dfed5b0f9c6074f14322332e97493d32fef0", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b83dcacd2ec7fcc5a48be215f82d573759f87ec2", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6", "versionType": "git"}], "programFiles": ["net/bluetooth/hidp/core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.35", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.12", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/hidp/core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1f08a90013e1e632b34321334e861fcefc056505"}, {"url": "https://git.kernel.org/stable/c/cc3832b19f863e3677c5651f001a2e3795f39eb8"}, {"url": "https://git.kernel.org/stable/c/d313683d6ccdd8c01e0562270a2ae25b86d8461d"}, {"url": "https://git.kernel.org/stable/c/d7d6a81b8dd1a8d084a1b755db9406041d53adb5"}, {"url": "https://git.kernel.org/stable/c/6348dfed5b0f9c6074f14322332e97493d32fef0"}, {"url": "https://git.kernel.org/stable/c/b83dcacd2ec7fcc5a48be215f82d573759f87ec2"}, {"url": "https://git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: fix missing length checks in hidp_input_report()\n\nhidp_input_report() reads keyboard and mouse payload data from an skb\nwithout first verifying that skb->len contains enough data.\n\nhidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching\nto hidp_input_report(). If a paired device sends a truncated packet,\nthe handler reads beyond the valid skb data, resulting in an\nout-of-bounds read of skb data. The OOB bytes may be interpreted as\nphantom key presses or spurious mouse movement.\n\nReplace the open-coded length tracking and pointer arithmetic with\nskb_pull_data() calls. skb_pull_data() returns NULL if the requested\nbytes are not present, eliminating the need for a manual size variable\nand the separate skb->len guard."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.93", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.35", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.12", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:37:34.167Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63947", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:17:58.868Z", "dateReserved": "2026-07-19T07:54:57.023Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T14:55:41.306Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If a paired device sends a truncated packet,\nthe handler reads beyond the valid skb data, resulting in an\nout-of-bounds read of skb data. The OOB bytes may be interpreted as\nphantom key presses or spurious mouse movement.\n\nReplace the open-coded length tracking and pointer arithmetic with\nskb_pull_data() calls. skb_pull_data() returns NULL if the requested\nbytes are not present, eliminating the need for a manual size variable\nand the separate skb->len guard."}], "id": "CVE-2026-63947", "lastModified": "2026-10-28T14:03:44.050", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63947", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:34:08.064493Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:13.337", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f08a90013e1e632b34321334e861fcefc056505"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6348dfed5b0f9c6074f14322332e97493d32fef0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b83dcacd2ec7fcc5a48be215f82d573759f87ec2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc3832b19f863e3677c5651f001a2e3795f39eb8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d313683d6ccdd8c01e0562270a2ae25b86d8461d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7d6a81b8dd1a8d084a1b755db9406041d53adb5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: HIDP: fix missing length checks in hidp_input_report()", "id": "2502388", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502388"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's Bluetooth Human Interface Device Protocol (HIDP). A remote attacker, by sending specially crafted truncated packets from a paired Bluetooth device, could trigger an out-of-bounds read in the `hidp_input_report()` function. This vulnerability may lead to unintended input, such as phantom key presses or spurious mouse movements, potentially affecting system integrity or user interaction."], "name": "CVE-2026-63947", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63947\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63947\nhttps://lore.kernel.org/linux-cve-announce/2026071954-CVE-2026-63947-dc2f@gregkh/T"], "threat_severity": "Moderate"}

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