CVE-2026-31773

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-31773
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SMP: derive legacy responder STK authentication from MITM state The legacy responder path in smp_random() currently labels the stored STK as authenticated whenever pending_sec_level is BT_SECURITY_HIGH. That reflects what the local service requested, not what the pairing flow actually achieved. For Just Works/Confirm legacy pairing, SMP_FLAG_MITM_AUTH stays clear and the resulting STK should remain unauthenticated even if the local side requested HIGH security. Use the established MITM state when storing the responder STK so the key metadata matches the pairing result. This also keeps the legacy path aligned with the Secure Connections code, which already treats JUST_WORKS/JUST_CFM as unauthenticated.

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/061ee71ac6b03c9f8432fe49538c3682bfcf4cf3 Patch
https://git.kernel.org/stable/c/0afc846bd80073ffcd2b8040f2b2fafaea3d9f72 Patch
https://git.kernel.org/stable/c/20756fec2f0108cb88e815941f1ffff88dc286fe Patch
https://git.kernel.org/stable/c/667f44f1392df6482483756458c48670e579e9ff Patch
https://git.kernel.org/stable/c/929db734d12db41ca5f95424db4612397f1bd4a7 Patch
https://git.kernel.org/stable/c/9a38659a3d06080715691bd3139f9c4b61f688e3 Patch
https://git.kernel.org/stable/c/9a6d0db176f082685e0b6149700c0baf3ce2aa8b Patch
https://git.kernel.org/stable/c/b1c6a8e554a39b222c0879a288ea98e338fc4d77 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.16:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
History

11 May 2026, 20:38

Type Values Removed Values Added
CWE NVD-CWE-noinfo
References () https://git.kernel.org/stable/c/061ee71ac6b03c9f8432fe49538c3682bfcf4cf3 - () https://git.kernel.org/stable/c/061ee71ac6b03c9f8432fe49538c3682bfcf4cf3 - Patch
References () https://git.kernel.org/stable/c/0afc846bd80073ffcd2b8040f2b2fafaea3d9f72 - () https://git.kernel.org/stable/c/0afc846bd80073ffcd2b8040f2b2fafaea3d9f72 - Patch
References () https://git.kernel.org/stable/c/20756fec2f0108cb88e815941f1ffff88dc286fe - () https://git.kernel.org/stable/c/20756fec2f0108cb88e815941f1ffff88dc286fe - Patch
References () https://git.kernel.org/stable/c/667f44f1392df6482483756458c48670e579e9ff - () https://git.kernel.org/stable/c/667f44f1392df6482483756458c48670e579e9ff - Patch
References () https://git.kernel.org/stable/c/929db734d12db41ca5f95424db4612397f1bd4a7 - () https://git.kernel.org/stable/c/929db734d12db41ca5f95424db4612397f1bd4a7 - Patch
References () https://git.kernel.org/stable/c/9a38659a3d06080715691bd3139f9c4b61f688e3 - () https://git.kernel.org/stable/c/9a38659a3d06080715691bd3139f9c4b61f688e3 - Patch
References () https://git.kernel.org/stable/c/9a6d0db176f082685e0b6149700c0baf3ce2aa8b - () https://git.kernel.org/stable/c/9a6d0db176f082685e0b6149700c0baf3ce2aa8b - Patch
References () https://git.kernel.org/stable/c/b1c6a8e554a39b222c0879a288ea98e338fc4d77 - () https://git.kernel.org/stable/c/b1c6a8e554a39b222c0879a288ea98e338fc4d77 - Patch
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.16:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
First Time Linux linux Kernel
Linux

03 May 2026, 07:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 8.8

01 May 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-01 15:16

Updated : 2026-05-11 20:38

NVD link : CVE-2026-31773

Mitre link : CVE-2026-31773

CVE.ORG link : CVE-2026-31773

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo