CVE-2026-63975

Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

State: Published
Severity: 8.8 High
Published: Jul 19, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected.

Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-667 Improper Locking

Affected Products

Product	Versions
LinuxLinux	15f02b91056253e8cdc592888f431da0731337b8 to before 3c8eaa91eb433c450426539290be4ffe282e9f00Affected 15f02b91056253e8cdc592888f431da0731337b8 to before ecfed1e0d8efecad6737a0d83e21d2fd021d8c48Affected 15f02b91056253e8cdc592888f431da0731337b8 to before e6833e737a51db1e5ea0401322acf5e22abd8be6Affected 15f02b91056253e8cdc592888f431da0731337b8 to before 6319b38fe69f56ed95680ade485b957a53fff642Affected 15f02b91056253e8cdc592888f431da0731337b8 to before 291eec1041c918c460dc9702e44edd17794b4a4bAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 41e29548b5e8b5e5fcf708786b3bea67cab107faAffected 15f02b91056253e8cdc592888f431da0731337b8 to before d153b8898c0051eb8b6a083b35cbe304a5886bd5Affected 15f02b91056253e8cdc592888f431da0731337b8 to before 41c2713b204e6cb6a94587bc6bf6935107df5479Affected
LinuxLinux	5.7Affected before 5.7Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.93 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.12 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

15f02b91056253e8cdc592888f431da0731337b8 to before 3c8eaa91eb433c450426539290be4ffe282e9f00Affected
15f02b91056253e8cdc592888f431da0731337b8 to before ecfed1e0d8efecad6737a0d83e21d2fd021d8c48Affected
15f02b91056253e8cdc592888f431da0731337b8 to before e6833e737a51db1e5ea0401322acf5e22abd8be6Affected
15f02b91056253e8cdc592888f431da0731337b8 to before 6319b38fe69f56ed95680ade485b957a53fff642Affected
15f02b91056253e8cdc592888f431da0731337b8 to before 291eec1041c918c460dc9702e44edd17794b4a4bAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 41e29548b5e8b5e5fcf708786b3bea67cab107faAffected
15f02b91056253e8cdc592888f431da0731337b8 to before d153b8898c0051eb8b6a083b35cbe304a5886bd5Affected
15f02b91056253e8cdc592888f431da0731337b8 to before 41c2713b204e6cb6a94587bc6bf6935107df5479Affected

LinuxLinux

5.7Affected
before 5.7Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.93 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.12 through 7.0.*Not affected
7.1 and laterNot affected

References

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