{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43134", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.988Z", "datePublished": "2026-05-06T11:27:21.541Z", "dateUpdated": "2026-08-05T12:26:10.307Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:10.307Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ\n\nThis adds a check for encryption key size upon receiving\nL2CAP_LE_CONN_REQ which is required by L2CAP/LE/CFC/BV-15-C which\nexpects L2CAP_CR_LE_BAD_KEY_SIZE." } ], "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:N", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The vulnerable request is an incoming Bluetooth LE L2CAP signaling packet from a nearby Bluetooth peer, so exploitation requires adjacent radio proximity rather than IP network or local shell access.\nAC:L - An attacker who can establish an LE link can send an L2CAP_LE_CONN_REQ with an insufficient encryption key size and reliably reach the missing check; there is no race or condition outside attacker control.\nPR:N - The attacker does not need privileges on the target system; Bluetooth pairing/encryption is a protocol precondition, not an OS privilege, and the vulnerable authorization decision is made from received peer traffic.\nUI:N - In a reasonable deployment with a listening LE L2CAP service and connectable device, exploitation is triggered by the adjacent peer’s protocol messages without requiring the victim to open a file, mount anything, or perform an action.\nS:U - The issue bypasses Bluetooth/L2CAP security policy within the same kernel and host Bluetooth service security authority, with no VM, sandbox, or hardware boundary escape.\nC:H - Accepting a channel despite an insufficient encryption key can expose all data carried by a protected LE Credit Based L2CAP service; for high-impact Bluetooth deployments, that can disclose sensitive application or device-control data.\nI:H - The same security bypass can allow an adjacent peer using inadequate encryption strength to send commands or modify state over a service that should have rejected the connection, giving high integrity impact in the protected service context.\nA:N - The bug is a missing key-size enforcement check and does not indicate memory corruption, panic, deadlock, resource exhaustion, or another availability failure." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/l2cap_core.c" ], "versions": [ { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "335071c0c3637064ec250481f589075db44fe4e6", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "fa6ad76fa8623c0a50d529cd5726fa5d819a3be4", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "9118601ff90b79e8df3c0c98f48ae00c1b02ecef", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "481ea39b342c347b6ac029f3d418486280be4e45", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "ec91078e132179b04e0c3906b599816c056ceaad", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "96581749c7c14fbec32c35728520867929600041", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "8dd43f9a9323f9c01bc8246da8d81a4c783c9e97", "status": "affected", "versionType": "git" }, { "version": "27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d", "lessThan": "138d7eca445ef37a0333425d269ee59900ca1104", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/l2cap_core.c" ], "versions": [ { "version": "3.14", "status": "affected" }, { "version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.252", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.202", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "3.14", "versionEndExcluding": "5.10.252" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.202" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6" }, { "url": "https://git.kernel.org/stable/c/fa6ad76fa8623c0a50d529cd5726fa5d819a3be4" }, { "url": "https://git.kernel.org/stable/c/9118601ff90b79e8df3c0c98f48ae00c1b02ecef" }, { "url": "https://git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45" }, { "url": "https://git.kernel.org/stable/c/ec91078e132179b04e0c3906b599816c056ceaad" }, { "url": "https://git.kernel.org/stable/c/96581749c7c14fbec32c35728520867929600041" }, { "url": "https://git.kernel.org/stable/c/8dd43f9a9323f9c01bc8246da8d81a4c783c9e97" }, { "url": "https://git.kernel.org/stable/c/138d7eca445ef37a0333425d269ee59900ca1104" } ], "title": "Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ", "x_generator": { "engine": "bippy-1.2.0" } } } }