CVE-2026-31773

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Use the established MITM state when\nstoring the responder STK so the key metadata matches the pairing result.\n\nThis also keeps the legacy path aligned with the Secure Connections code,\nwhich already treats JUST_WORKS/JUST_CFM as unauthenticated."}], "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 vulnerable SMP legacy pairing path is reached by Bluetooth LE Security Manager PDUs over the L2CAP SMP fixed channel, so the attacker must be within Bluetooth radio range.\nAC:L - A nearby attacker can drive the Pairing Request/Confirm/Random exchange and trigger the responder STK metadata error without winning a race or relying on memory layout.\nPR:N - The affected code runs during Bluetooth pairing before the remote peer has authenticated or obtained any prior privileges on the target.\nUI:N - Although some deployments may ask a user-space agent to confirm pairing, headless or auto-confirming BLE deployments can complete Just Works/Confirm pairing without human action, so the higher-severity reasonable case is no user interaction.\nS:U - The bug misclassifies Bluetooth link/key authentication inside the same host Bluetooth security authority and does not cross a VM, sandbox, or hardware isolation boundary.\nC:H - An unauthenticated adjacent peer can cause unauthenticated legacy pairing material to be treated as authenticated, allowing access to data exposed only to BT_SECURITY_HIGH peers in high-value BLE deployments.\nI:H - The same authentication bypass can let the peer perform writes or control operations guarded by authenticated Bluetooth security, including persistent trusted-key use after pairing.\nA:H - In severe but reasonable embedded or controller BLE deployments, unauthorized authenticated-level control access can disable, reset, or otherwise disrupt protected device functionality."}]}], "affected": 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from MITM state", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31773", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:13:09.381420Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-287", "description": "CWE-287 Improper Authentication"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:06:08.313Z"}}]}}

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A nearby attacker can drive the Pairing Request/Confirm/Random exchange and trigger the responder STK metadata error without winning a race or relying on memory layout.\nPR:N - The affected code runs during Bluetooth pairing before the remote peer has authenticated or obtained any prior privileges on the target.\nUI:N - Although some deployments may ask a user-space agent to confirm pairing, headless or auto-confirming BLE deployments can complete Just Works/Confirm pairing without human action, so the higher-severity reasonable case is no user interaction.\nS:U - The bug misclassifies Bluetooth link/key authentication inside the same host Bluetooth security authority and does not cross a VM, sandbox, or hardware isolation boundary.\nC:H - An unauthenticated adjacent peer can cause unauthenticated legacy pairing material to be treated as authenticated, allowing access to data exposed only to BT_SECURITY_HIGH peers in high-value BLE deployments.\nI:H - The same authentication bypass can let the peer perform writes or control operations guarded by authenticated Bluetooth security, including persistent trusted-key use after pairing.\nA:H - In severe but reasonable embedded or controller BLE deployments, unauthorized authenticated-level control access can disable, reset, or otherwise disrupt protected device functionality."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "9a38659a3d06080715691bd3139f9c4b61f688e3", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "667f44f1392df6482483756458c48670e579e9ff", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "929db734d12db41ca5f95424db4612397f1bd4a7", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "b1c6a8e554a39b222c0879a288ea98e338fc4d77", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "0afc846bd80073ffcd2b8040f2b2fafaea3d9f72", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "061ee71ac6b03c9f8432fe49538c3682bfcf4cf3", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "9a6d0db176f082685e0b6149700c0baf3ce2aa8b", "versionType": "git"}, {"status": "affected", "version": "fff3490f47810e2d34b91fb9e31103e923b11c2f", "lessThan": "20756fec2f0108cb88e815941f1ffff88dc286fe", "versionType": "git"}, {"status": "affected", "version": "14ec593d6bb050cf40a4ade2f9ac9ca050e0412c", "versionType": "git"}, {"status": "affected", "version": "3.15.5", "lessThan": "3.16", "versionType": "semver"}], "programFiles": ["net/bluetooth/smp.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.16"}, {"status": "unaffected", "version": "0", "lessThan": "3.16", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.253", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.168", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.134", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/smp.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9a38659a3d06080715691bd3139f9c4b61f688e3"}, {"url": "https://git.kernel.org/stable/c/667f44f1392df6482483756458c48670e579e9ff"}, {"url": "https://git.kernel.org/stable/c/929db734d12db41ca5f95424db4612397f1bd4a7"}, {"url": "https://git.kernel.org/stable/c/b1c6a8e554a39b222c0879a288ea98e338fc4d77"}, {"url": "https://git.kernel.org/stable/c/0afc846bd80073ffcd2b8040f2b2fafaea3d9f72"}, {"url": "https://git.kernel.org/stable/c/061ee71ac6b03c9f8432fe49538c3682bfcf4cf3"}, {"url": "https://git.kernel.org/stable/c/9a6d0db176f082685e0b6149700c0baf3ce2aa8b"}, {"url": "https://git.kernel.org/stable/c/20756fec2f0108cb88e815941f1ffff88dc286fe"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SMP: derive legacy responder STK authentication from MITM state\n\nThe legacy responder path in smp_random() currently labels the stored\nSTK as authenticated whenever pending_sec_level is BT_SECURITY_HIGH.\nThat reflects what the local service requested, not what the pairing\nflow actually achieved.\n\nFor Just Works/Confirm legacy pairing, SMP_FLAG_MITM_AUTH stays clear\nand the resulting STK should remain unauthenticated even if the local\nside requested HIGH security. Use the established MITM state when\nstoring the responder STK so the key metadata matches the pairing result.\n\nThis also keeps the legacy path aligned with the Secure Connections code,\nwhich already treats JUST_WORKS/JUST_CFM as unauthenticated."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.253", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.168", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.134", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.81", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.22", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.12", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "3.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "3.15.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:05.705Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31773", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:06:08.313Z", "dateReserved": "2026-03-09T15:48:24.140Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-01T14:15:01.277Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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currently labels the stored\nSTK as authenticated whenever pending_sec_level is BT_SECURITY_HIGH.\nThat reflects what the local service requested, not what the pairing\nflow actually achieved.\n\nFor Just Works/Confirm legacy pairing, SMP_FLAG_MITM_AUTH stays clear\nand the resulting STK should remain unauthenticated even if the local\nside requested HIGH security. Use the established MITM state when\nstoring the responder STK so the key metadata matches the pairing result.\n\nThis also keeps the legacy path aligned with the Secure Connections code,\nwhich already treats JUST_WORKS/JUST_CFM as unauthenticated."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: SMP: derivar la autenticaci\u00f3n STK del respondedor heredado del estado MitM\n\nLa ruta del respondedor heredado en smp_random() actualmente etiqueta la STK almacenada como autenticada siempre que pending_sec_level sea BT_SECURITY_HIGH. Eso refleja lo que el servicio local solicit\u00f3, no lo que el flujo de emparejamiento realmente logr\u00f3.\n\nPara el emparejamiento heredado Just Works/Confirm, SMP_FLAG_MITM_AUTH permanece despejado y la STK resultante deber\u00eda permanecer sin autenticar incluso si el lado local solicit\u00f3 seguridad ALTA. Utilice el estado MitM establecido al almacenar la STK del respondedor para que los metadatos de la clave coincidan con el resultado del emparejamiento.\n\nEsto tambi\u00e9n mantiene la ruta heredada alineada con el c\u00f3digo de Conexiones Seguras, que ya trata JUST_WORKS/JUST_CFM como sin autenticar."}], "id": "CVE-2026-31773", "lastModified": "2026-11-11T21:10:00.200", "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-2026-31773", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:13:09.381420Z", "version": "2.0.3"}}]}, "published": "2026-05-01T15:16:40.587", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/061ee71ac6b03c9f8432fe49538c3682bfcf4cf3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0afc846bd80073ffcd2b8040f2b2fafaea3d9f72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20756fec2f0108cb88e815941f1ffff88dc286fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/667f44f1392df6482483756458c48670e579e9ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/929db734d12db41ca5f95424db4612397f1bd4a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a38659a3d06080715691bd3139f9c4b61f688e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a6d0db176f082685e0b6149700c0baf3ce2aa8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1c6a8e554a39b222c0879a288ea98e338fc4d77"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-287"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: SMP: derive legacy responder STK authentication from MITM state", "id": "2464441", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464441"}, "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-372", "details": ["A flaw was found in the Linux kernel's Bluetooth Security Manager Protocol (SMP). The system incorrectly labels a Short Term Key (STK) as authenticated during legacy pairing, even when Man-in-the-Middle (MITM) protection was not established. This misrepresentation of the key's authentication status could allow an attacker to bypass expected security measures, potentially leading to unauthorized access or a downgrade of the Bluetooth connection's security."], "name": "CVE-2026-31773", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31773\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31773\nhttps://lore.kernel.org/linux-cve-announce/2026050149-CVE-2026-31773-e287@gregkh/T"], "threat_severity": "Moderate"}

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