CVE-2026-43062

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 21d3ba696918d6373233aac0b9d51fcabdedddc0affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 3b94e62caa1dc1198d0d55d97bd710da1dee15d7affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 111f74547eee8cfedfb854284e80f35c8a491186affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < dd3b221e21079ade8263fbb7176f3d55ad75d3b6affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < d90150c72d2e6a8a3079e88755dafcfbe91c746daffected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 5a1ea296f8589ce8f1e3141b2b123b34ad010e19affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < f110b8f58b254bf997cec1bd60701b7798e9bb82affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 15145675690cab2de1056e7ed68e59cbd0452529affected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.167 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.78 <= 6.12.*unaffected
LinuxLinux6.18.20 <= 6.18.*unaffected
LinuxLinux6.19.10 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References