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CVE

CVE-2026-43134

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix missing key size check for L2

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ This adds a check for encryption key size upon receiving L2CAP_LE_CONN_REQ which is required by L2CAP/LE/CFC/BV-15-C which expects L2CAP_CR_LE_BAD_KEY_SIZE.

HIGH · CVSS 8.1 EPSS 0.00015
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
▤

Affected Products & Versions

8
linux kernel>= 3.14 and < 5.10.252
linux kernel>= 5.11 and < 5.15.202
linux kernel>= 5.16 and < 6.1.165
linux kernel>= 6.2 and < 6.6.128
linux kernel>= 6.7 and < 6.12.75
linux kernel>= 6.13 and < 6.18.16
linux kernel>= 6.19 and < 6.19.6
linux kernelall versions
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 May 2026 · 12:16 PM
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://git.kernel.org/stable/c/138d7eca445ef37a0333425d269ee59900ca1104Patch
https://git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6Patch
https://git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45Patch
https://git.kernel.org/stable/c/8dd43f9a9323f9c01bc8246da8d81a4c783c9e97Patch
https://git.kernel.org/stable/c/9118601ff90b79e8df3c0c98f48ae00c1b02ecefPatch
https://git.kernel.org/stable/c/96581749c7c14fbec32c35728520867929600041Patch
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