CVE-2026-43062 Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
A type confusion in the Linux kernel Bluetooth L2CAP module causes valid packets to be rejected and incorrect data to be read, potentially leading to denial of service or information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43062?
CVE-2026-43062 is a high-severity vulnerability in Linux kernel, published on 5 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-843
Which versions are affected by CVE-2026-43062?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43062?
Apply the vendor's patch.
Is CVE-2026-43062 being exploited?
There is no known exploitation of CVE-2026-43062 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43062, DEBIAN-CVE-2026-43062, GHSA-6mf2-xqwv-jhq3, ROOT-OS-DEBIAN-11-CVE-2026-43062, ROOT-OS-UBUNTU-2204-CVE-2026-43062, ROOT-OS-UBUNTU-2404-CVE-2026-43062 and 1 more.