Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success

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Summary

CVECVE-2026-63976
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:16 UTC
Updated2026-07-20 15:16:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success l2cap_ecred_reconf_rsp() returns early on success without clearing chan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp, l2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a successful transaction to prevent the channel from matching subsequent responses with the recycled ident value. A remote attacker that completed a reconfiguration as the peer can replay a failure response with the stale ident, causing the kernel to match and destroy the already-established channel via l2cap_chan_del(chan, ECONNRESET). Clear chan->ident for all matching channels on success, and harden the failure path by using l2cap_chan_hold_unless_zero() consistent with other L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).

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

EPSS: 0.003090000 probability, percentile 0.229660000 (date 2026-07-20)

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 59f5ecf6ad5c4db6ae81965a96156954a3b0d89a git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 ae0152d77d101c920769934fb102b18de0c6f526 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 c2afd2613fda90107c5e2fe8e855627451749c78 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 cc2b4f749de09975bfa06e58bbbad2f6acd4c79c git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 3b5b5f423b4fd23404a393bda8adba3cd6f74ef1 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 f39049304ba655ffcbb92edbdf8c51a1f1210bed git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 8e7977afaef37c6bd2b2654f1bce6ab40d471147 git Not specified
CNA Linux Linux affected 15f02b91056253e8cdc592888f431da0731337b8 00e1950716c6ed67d74777b2db286b0fa23b4be9 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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