Bluetooth: L2CAP: fix chan mode for LE_CONN_REQ + EXT_FLOWCTL pchan

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98108
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:41 UTC
Updated2026-10-03 11:18:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan mode for LE_CONN_REQ + EXT_FLOWCTL pchan l2cap_new_connection() sets default value of channel mode to match the parent channel. l2cap_le_connect_req() left this at the default, and created L2CAP_MODE_EXT_FLOWCTL channels if listening pchan has that mode. This causes FLAG_DEFER_SETUP channels to reply to L2CAP_LE_CONN_REQ with L2CAP_ECRED_CONN_RSP, which is incorrect. It can also result to stack OOB write (of l2cap_alloc_cid determined values) in l2cap_ecred_rsp_defer(), as l2cap_le_connect_req() does not limit maximum number of deferred channels or check for duplicate ident. Fix by setting chan->mode correctly in l2cap_le_connect_req(). Also check channel mode in l2cap_ecred_rsp_defer(), and do WARN_ON_ONCE instead of OOB write to make it less brittle.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002260000 probability, percentile 0.119550000 (date 2026-09-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 ad0f44a3f1f688558ed876a0702bc2c82b0df689 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 564ae0e05e598aa895b9dbd18cb7d6eb64752869 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 aab17938998b29e75c3324763411aef3e300fc67 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 0e1fc7cab95ad958e55d70a5dfaaea687c9c639f git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 1074bcc57f741223f9fa82ce6afe5c3d783e4d10 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 6cb79e6499228cfdbd4b3301371ce74d01cd2f80 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 4ef05db5b08b176a551b4a6287372045998806b0 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6cb79e6499228cfdbd4b3301371ce74d01cd2f80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ef05db5b08b176a551b4a6287372045998806b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/564ae0e05e598aa895b9dbd18cb7d6eb64752869 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aab17938998b29e75c3324763411aef3e300fc67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e1fc7cab95ad958e55d70a5dfaaea687c9c639f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1074bcc57f741223f9fa82ce6afe5c3d783e4d10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad0f44a3f1f688558ed876a0702bc2c82b0df689 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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