CVE-2026-43062

Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()

State: Published
Severity: 7.1 High
Published: May 5, 2026
Updated: Oct 19, 2026
Reserved: May 1, 2026

Description

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

Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()

l2cap_ecred_reconf_rsp() casts the incoming data to struct l2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with result at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes with result at offset 0).

This causes two problems:

- The sizeof(*rsp) length check requires 8 bytes instead of the correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected with -EPROTO.

- rsp->result reads from offset 6 instead of offset 0, returning wrong data when the packet is large enough to pass the check.

Fix by using the correct type. Also pass the already byte-swapped result variable to BT_DBG instead of the raw __le16 field.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L	Linux

Weaknesses

CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

Affected Products

Product	Versions
LinuxLinux	15f02b91056253e8cdc592888f431da0731337b8 to before 21d3ba696918d6373233aac0b9d51fcabdedddc0Affected 15f02b91056253e8cdc592888f431da0731337b8 to before 3b94e62caa1dc1198d0d55d97bd710da1dee15d7Affected 15f02b91056253e8cdc592888f431da0731337b8 to before 111f74547eee8cfedfb854284e80f35c8a491186Affected 15f02b91056253e8cdc592888f431da0731337b8 to before dd3b221e21079ade8263fbb7176f3d55ad75d3b6Affected 15f02b91056253e8cdc592888f431da0731337b8 to before d90150c72d2e6a8a3079e88755dafcfbe91c746dAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 5a1ea296f8589ce8f1e3141b2b123b34ad010e19Affected 15f02b91056253e8cdc592888f431da0731337b8 to before f110b8f58b254bf997cec1bd60701b7798e9bb82Affected 15f02b91056253e8cdc592888f431da0731337b8 to before 15145675690cab2de1056e7ed68e59cbd0452529Affected
LinuxLinux	5.7Affected before 5.7Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.167 through 6.1.Not affected 6.6.130 through 6.6.Not affected 6.12.78 through 6.12.Not affected 6.18.20 through 6.18.Not affected 6.19.10 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

15f02b91056253e8cdc592888f431da0731337b8 to before 21d3ba696918d6373233aac0b9d51fcabdedddc0Affected
15f02b91056253e8cdc592888f431da0731337b8 to before 3b94e62caa1dc1198d0d55d97bd710da1dee15d7Affected
15f02b91056253e8cdc592888f431da0731337b8 to before 111f74547eee8cfedfb854284e80f35c8a491186Affected
15f02b91056253e8cdc592888f431da0731337b8 to before dd3b221e21079ade8263fbb7176f3d55ad75d3b6Affected
15f02b91056253e8cdc592888f431da0731337b8 to before d90150c72d2e6a8a3079e88755dafcfbe91c746dAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 5a1ea296f8589ce8f1e3141b2b123b34ad010e19Affected
15f02b91056253e8cdc592888f431da0731337b8 to before f110b8f58b254bf997cec1bd60701b7798e9bb82Affected
15f02b91056253e8cdc592888f431da0731337b8 to before 15145675690cab2de1056e7ed68e59cbd0452529Affected

LinuxLinux

5.7Affected
before 5.7Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.167 through 6.1.*Not affected
6.6.130 through 6.6.*Not affected
6.12.78 through 6.12.*Not affected
6.18.20 through 6.18.*Not affected
6.19.10 through 6.19.*Not affected
7.0 and laterNot affected

References

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