CVE-2026-31513

A flaw was found in the Linux kernel's Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) component. A remote attacker can send a specially crafted Enhanced Credit Based Connection Request with an excessive number of Source Channel IDs (SCIDs). This can cause a stack-out-of-bounds read when processing the malformed request, leading to a kernel panic and a Denial of Service (DoS) on the affected system.

The fix assigns rsp_len only after validating num_scid so error responses cannot read past the small on-stack pdu buffer. Red Hat concurs with upstream that this is primarily a remote-triggerable crash against the Bluetooth stack. Patch kernels promptly.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the bluetooth module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.