Out-of-bounds Read Affecting kernel-rt-debug package, versions *


Severity

Recommended
medium

Based on CentOS security rating.

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  • Snyk IDSNYK-CENTOS9-KERNELRTDEBUG-16145681
  • published23 Apr 2026
  • disclosed22 Apr 2026

Introduced: 22 Apr 2026

NewCVE-2026-31513  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

There is no fixed version for Centos:9 kernel-rt-debug.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by Centos. See How to fix? for Centos:9 relevant fixed versions and status.

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

Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req

Syzbot reported a KASAN stack-out-of-bounds read in l2cap_build_cmd() that is triggered by a malformed Enhanced Credit Based Connection Request.

The vulnerability stems from l2cap_ecred_conn_req(). The function allocates a local stack buffer (pdu) designed to hold a maximum of 5 Source Channel IDs (SCIDs), totaling 18 bytes. When an attacker sends a request with more than 5 SCIDs, the function calculates rsp_len based on this unvalidated cmd_len before checking if the number of SCIDs exceeds L2CAP_ECRED_MAX_CID.

If the SCID count is too high, the function correctly jumps to the response label to reject the packet, but rsp_len retains the attacker's oversized value. Consequently, l2cap_send_cmd() is instructed to read past the end of the 18-byte pdu buffer, triggering a KASAN panic.

Fix this by moving the assignment of rsp_len to after the num_scid boundary check. If the packet is rejected, rsp_len will safely remain 0, and the error response will only read the 8-byte base header from the stack.

CVSS Base Scores

version 3.1