Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ

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Summary

CVECVE-2026-43134
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:30 UTC
Updated2026-05-12 21:11:06 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.000130000 probability, percentile 0.020280000 (date 2026-05-12)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d 335071c0c3637064ec250481f589075db44fe4e6 git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d fa6ad76fa8623c0a50d529cd5726fa5d819a3be4 git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d 9118601ff90b79e8df3c0c98f48ae00c1b02ecef git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d 481ea39b342c347b6ac029f3d418486280be4e45 git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d ec91078e132179b04e0c3906b599816c056ceaad git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d 96581749c7c14fbec32c35728520867929600041 git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d 8dd43f9a9323f9c01bc8246da8d81a4c783c9e97 git Not specified
CNA Linux Linux affected 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d 138d7eca445ef37a0333425d269ee59900ca1104 git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9118601ff90b79e8df3c0c98f48ae00c1b02ecef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/138d7eca445ef37a0333425d269ee59900ca1104 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ec91078e132179b04e0c3906b599816c056ceaad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fa6ad76fa8623c0a50d529cd5726fa5d819a3be4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/96581749c7c14fbec32c35728520867929600041 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8dd43f9a9323f9c01bc8246da8d81a4c783c9e97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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