CVE-2026-64126

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The handler\nthen uses cp->adv_data_len and cp->scan_rsp_len to validate and copy\ncp->data, but it never checks that those bytes are part of the mgmt\ncommand payload.\n\nA short command can therefore make add_ext_adv_data() pass an\nout-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond\nthe command buffer are addressable, they can also be copied into the\nadvertising instance as scan response data, where the caller can read\nthem back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires\nCAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte\nslab-out-of-bounds read.\n\nReject commands whose length does not match the fixed header plus both\nadvertising data lengths before parsing cp->data."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only through a local Bluetooth MGMT socket (AF_BLUETOOTH, HCI_CHANNEL_CONTROL) via sendmsg(), not from remote Bluetooth air traffic or network protocols.\nAC:L - An attacker fully controls the malformed MGMT command and length fields and can retry reliably; no race or victim-dependent timing is required to trigger the out-of-bounds read and copy.\nPR:L - Exploitation requires CAP_NET_ADMIN to obtain an HCI_SOCK_TRUSTED MGMT socket, which is reachable by an unprivileged user via user namespaces (e.g. unshare with CAP_NET_ADMIN) on the CONTROL-channel bind path.\nUI:N - No victim interaction is required; the attacker triggers the flaw directly by sending a crafted MGMT_OP_ADD_EXT_ADV_DATA command.\nS:U - Impact is confined to kernel memory disclosure and modification of Bluetooth advertising state within the same kernel security boundary, with no VM escape or cross-authority boundary crossing.\nC:H - A short command causes slab out-of-bounds reads (KASAN-reported) via tlv_data_is_valid(), and addressable bytes beyond the command buffer can be copied into scan response data and potentially exfiltrated over BLE advertising.\nI:H - The out-of-bounds pointer is used in memcpy() into kernel advertising structures, constituting kernel memory corruption with attacker-influenced content that can alter system-controlled Bluetooth data.\nA:L - While the primary impact is information disclosure, out-of-bounds kernel memory access can cause oopses or instability on some layouts; when uncertain, availability impact is rated 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no race or victim-dependent timing is required to trigger the out-of-bounds read and copy.\nPR:L - Exploitation requires CAP_NET_ADMIN to obtain an HCI_SOCK_TRUSTED MGMT socket, which is reachable by an unprivileged user via user namespaces (e.g. unshare with CAP_NET_ADMIN) on the CONTROL-channel bind path.\nUI:N - No victim interaction is required; the attacker triggers the flaw directly by sending a crafted MGMT_OP_ADD_EXT_ADV_DATA command.\nS:U - Impact is confined to kernel memory disclosure and modification of Bluetooth advertising state within the same kernel security boundary, with no VM escape or cross-authority boundary crossing.\nC:H - A short command causes slab out-of-bounds reads (KASAN-reported) via tlv_data_is_valid(), and addressable bytes beyond the command buffer can be copied into scan response data and potentially exfiltrated over BLE advertising.\nI:H - The out-of-bounds pointer is used in memcpy() into kernel advertising structures, constituting kernel memory corruption with attacker-influenced content that can alter system-controlled Bluetooth data.\nA:L - While the primary impact is information disclosure, out-of-bounds kernel memory access can cause oopses or instability on some layouts; when uncertain, availability impact is rated above none."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "0d5104390b445e7bd664ad583837e4c04d892c9d", "versionType": "git"}, {"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "14b01b9cba04e6ce82825f68fc4c4322fa4ffa43", "versionType": "git"}, {"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "a143ce77a5292f2c9285137433d879ce71d190a7", "versionType": "git"}, {"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "a6c75a3fad226ccbd8ef9110dee87c92c299f2ab", "versionType": "git"}, {"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "f1febe93ef075314615f970a87681d9ab86691d1", "versionType": "git"}, {"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "0bc1a5a69f541859293d79db72bd7854ac48df51", "versionType": "git"}, {"status": "affected", "version": "12410572833a283ce92fcf9679ca8a2f372097ee", "lessThan": "d3f7d17960ed50df3a6709c5158caff989c8c905", "versionType": "git"}], "programFiles": ["net/bluetooth/mgmt.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"status": "unaffected", "version": "0", "lessThan": "5.11", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/mgmt.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d"}, {"url": "https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43"}, {"url": "https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7"}, {"url": "https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab"}, {"url": "https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1"}, {"url": "https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51"}, {"url": "https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate Add Extended Advertising Data length\n\nMGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command,\nwith MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size. The handler\nthen uses cp->adv_data_len and cp->scan_rsp_len to validate and copy\ncp->data, but it never checks that those bytes are part of the mgmt\ncommand payload.\n\nA short command can therefore make add_ext_adv_data() pass an\nout-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond\nthe command buffer are addressable, they can also be copied into the\nadvertising instance as scan response data, where the caller can read\nthem back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires\nCAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte\nslab-out-of-bounds read.\n\nReject commands whose length does not match the fixed header plus both\nadvertising data lengths before parsing cp->data."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.142", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.92", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.34", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.11", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:32.975Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64126", "state": "PUBLISHED", "dateUpdated": "2026-10-16T15:42:24.427Z", "dateReserved": "2026-07-19T07:54:57.036Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T15:40:23.276Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The handler\nthen uses cp->adv_data_len and cp->scan_rsp_len to validate and copy\ncp->data, but it never checks that those bytes are part of the mgmt\ncommand payload.\n\nA short command can therefore make add_ext_adv_data() pass an\nout-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond\nthe command buffer are addressable, they can also be copied into the\nadvertising instance as scan response data, where the caller can read\nthem back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires\nCAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte\nslab-out-of-bounds read.\n\nReject commands whose length does not match the fixed header plus both\nadvertising data lengths before parsing cp->data."}], "id": "CVE-2026-64126", "lastModified": "2026-10-19T21:17:25.073", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64126", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:36:50.332780Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:54.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bc1a5a69f541859293d79db72bd7854ac48df51"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d5104390b445e7bd664ad583837e4c04d892c9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/14b01b9cba04e6ce82825f68fc4c4322fa4ffa43"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a143ce77a5292f2c9285137433d879ce71d190a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6c75a3fad226ccbd8ef9110dee87c92c299f2ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3f7d17960ed50df3a6709c5158caff989c8c905"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1febe93ef075314615f970a87681d9ab86691d1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "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: MGMT: validate Add Extended Advertising Data length", "id": "2502557", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502557"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-805", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: MGMT: validate Add Extended Advertising Data length\nMGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command,\nwith MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size. The handler\nthen uses cp->adv_data_len and cp->scan_rsp_len to validate and copy\ncp->data, but it never checks that those bytes are part of the mgmt\ncommand payload.\nA short command can therefore make add_ext_adv_data() pass an\nout-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond\nthe command buffer are addressable, they can also be copied into the\nadvertising instance as scan response data, where the caller can read\nthem back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires\nCAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte\nslab-out-of-bounds read.\nReject commands whose length does not match the fixed header plus both\nadvertising data lengths before parsing cp->data.", "A flaw was found in the Linux kernel's Bluetooth Management (MGMT) subsystem. The handler for the MGMT_OP_ADD_EXT_ADV_DATA command does not correctly validate the lengths of extended advertising data and scan response data against the overall command payload. This oversight allows a local attacker with CAP_NET_ADMIN capabilities to craft a specially malformed command. Successful exploitation can lead to an out-of-bounds read, resulting in information disclosure where sensitive data beyond the command buffer may be exposed."], "name": "CVE-2026-64126", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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-2026-64126\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64126\nhttps://lore.kernel.org/linux-cve-announce/2026071925-CVE-2026-64126-a17e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,0d5104390b445e7bd664ad583837e4c04d892c9d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,14b01b9cba04e6ce82825f68fc4c4322fa4ffa43)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,a143ce77a5292f2c9285137433d879ce71d190a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,a6c75a3fad226ccbd8ef9100dee87c92c299f2ab)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,f1febe93ef075314615f970a87681d9ab86691d1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,0bc1a5a69f541859293d79db72bd7854ac48df51)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[12410572833a283ce92fcf9679ca8a2f372097ee,d3f7d17960ed50df3a6709c5158caff989c8c905)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.210,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.175,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.142,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.92,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.34,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.11,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T10:45:02.434849+00:00", "updated": "2026-08-13T18:15:04.841073+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}