{"id":"CVE-2026-43134","title":"Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ","summary":"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 L2CA…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 335071c0c3637064ec250481f589075db44fe4e6","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < fa6ad76fa8623c0a50d529cd5726fa5d819a3be4","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 9118601ff90b79e8df3c0c98f48ae00c1b02ecef","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 481ea39b342c347b6ac029f3d418486280be4e45","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < ec91078e132179b04e0c3906b599816c056ceaad","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 96581749c7c14fbec32c35728520867929600041","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 8dd43f9a9323f9c01bc8246da8d81a4c783c9e97","Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 138d7eca445ef37a0333425d269ee59900ca1104","Linux 3.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:15:03.252855Z"},"published":"2026-05-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:34.214Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43134","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"}],"tags":["cve.org"],"epss":0.00237,"epssPercentile":0.13702,"ingestedAt":"2026-10-16T17:24:46.684Z","slug":"CVE-2026-43134","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 335071c0c3637064ec250481f589075db44fe4e6`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < fa6ad76fa8623c0a50d529cd5726fa5d819a3be4`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 9118601ff90b79e8df3c0c98f48ae00c1b02ecef`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 481ea39b342c347b6ac029f3d418486280be4e45`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < ec91078e132179b04e0c3906b599816c056ceaad`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 96581749c7c14fbec32c35728520867929600041`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 8dd43f9a9323f9c01bc8246da8d81a4c783c9e97`\n- `Linux >= 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d < 138d7eca445ef37a0333425d269ee59900ca1104`\n- `Linux 3.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}