PT-2026-37474 · Linux · Linux Kernel

CVE-2026-43134 · Published 2026-05-06 · Updated 2026-07-10

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Bluetooth L2CAP component fails to perform a key size check when receiving L2CAP LE CONN REQ. This missing validation is contrary to the L2CAP/LE/CFC/BV-15-C requirement, which expects the system to return L2CAP CR LE BAD KEY SIZE when the encryption key size is invalid.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Related Identifiers

CVE-2026-43134

OESA-2026-2492

OESA-2026-2493

OESA-2026-2494

OESA-2026-2495

USN-8492-1

USN-8492-2

USN-8492-3

USN-8492-4

USN-8492-5

USN-8497-1

USN-8498-1

USN-8499-1

Affected Products

Linux Kernel

References · 604

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43134.json · Exploit
• https://ubuntu.com/security/CVE-2026-23215 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23131 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8492-4 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-22990 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43407 · Security Note
• https://ubuntu.com/security/notices/USN-8492-5 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43278 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2493 · Vendor Advisory
• https://git.kernel.org/stable/c/138d7eca445ef37a0333425d269ee59900ca1104 · Patch
• https://ubuntu.com/security/CVE-2026-31478 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23124 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71274 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8499-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43033 · Vendor Advisory