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CVE-2026-43134

Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ

HIGH
8.1
CVSS Score
Published: May 6, 2026 at 11:27 AM UTC
Updated: October 19, 2026 at 08:18 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.1
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
3.14 ≤ v < 5.10.2525.11 ≤ v < 5.15.2025.16 ≤ v < 6.1.1656.13 ≤ v < 6.18.166.19 ≤ v < 6.19.66.2 ≤ v < 6.6.1286.7 ≤ v < 6.12.7527e2d4c8d28be1d1b4ecfbffab572d7dbd35254d3.147.07.0 rc1
Vendor states this is fixed in 138d7eca445ef37a0333425d269ee59900ca1104 (fixed)
Vendor states this is fixed in 335071c0c3637064ec250481f589075db44fe4e6 (fixed)
Vendor states this is fixed in 481ea39b342c347b6ac029f3d418486280be4e45 (fixed)
Vendor states this is fixed in 8dd43f9a9323f9c01bc8246da8d81a4c783c9e97 (fixed)
Vendor states this is fixed in 9118601ff90b79e8df3c0c98f48ae00c1b02ecef (fixed)
Vendor states this is fixed in 96581749c7c14fbec32c35728520867929600041 (fixed)
Vendor states this is fixed in ec91078e132179b04e0c3906b599816c056ceaad (fixed)
Vendor states this is fixed in fa6ad76fa8623c0a50d529cd5726fa5d819a3be4 (fixed)
Vendor states this is fixed in 3.14 (unaffected)
Vendor states this is fixed in 5.10.252 (unaffected)
Vendor states this is fixed in 5.15.202 (unaffected)
Vendor states this is fixed in 6.1.165 (unaffected)
Vendor states this is fixed in 6.12.75 (unaffected)
Vendor states this is fixed in 6.18.16 (unaffected)
Vendor states this is fixed in 6.19.6 (unaffected)
Vendor states this is fixed in 6.6.128 (unaffected)
Vendor states this is fixed in 7.0 (unaffected)

References (8)

Patch
Source: cverecord
https://git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6
Patch
Source: cverecord
https://git.kernel.org/stable/c/fa6ad76fa8623c0a50d529cd5726fa5d819a3be4
Patch
Source: cverecord
https://git.kernel.org/stable/c/9118601ff90b79e8df3c0c98f48ae00c1b02ecef
Patch
Source: cverecord
https://git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45
Patch
Source: cverecord
https://git.kernel.org/stable/c/ec91078e132179b04e0c3906b599816c056ceaad
Patch
Source: cverecord
https://git.kernel.org/stable/c/96581749c7c14fbec32c35728520867929600041
Patch
Source: cverecord
https://git.kernel.org/stable/c/8dd43f9a9323f9c01bc8246da8d81a4c783c9e97
Patch
Source: cverecord
https://git.kernel.org/stable/c/138d7eca445ef37a0333425d269ee59900ca1104

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfoCWE-326

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