Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-23395
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 11:16:40 UTC
Updated2026-04-02 09:16:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ Currently the code attempts to accept requests regardless of the command identifier which may cause multiple requests to be marked as pending (FLAG_DEFER_SETUP) which can cause more than L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer causing an overflow. The spec is quite clear that the same identifier shall not be used on subsequent requests: 'Within each signaling channel a different Identifier shall be used for each successive request or indication.' https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d So this attempts to check if there are any channels pending with the same identifier and rejects if any are found.

Risk And Classification

Primary CVSS: v3.1 8.8 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:H

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 2124d82fd25e1671bb3ceb37998af5aae5903e06 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 8d0d94f8ba5b3a0beec3b0da558b9bea48018117 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 e72ee455297b794b852e5cea8d2d7bb17312172a git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 5b3e2052334f2ff6d5200e952f4aa66994d09899 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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