Out-of-bounds Read Affecting kernel-64k-debug-core package, versions <0:5.14.0-687.47.1.el9_8


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.27% (19th percentile)

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  • Snyk IDSNYK-ALMALINUX9-KERNEL64KDEBUGCORE-19902444
  • published18 Sept 2026
  • disclosed14 Sept 2026

Introduced: 14 Sep 2026

NewCVE-2026-53254  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 kernel-64k-debug-core to version 0:5.14.0-687.47.1.el9_8 or higher.
This issue was patched in ALSA-2026:67150.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-debug-core package and not the kernel-64k-debug-core package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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

Bluetooth: RFCOMM: validate skb length in MCC handlers

The RFCOMM MCC handlers cast skb->data to protocol-specific structs without validating skb->len first. A malicious remote device can send truncated MCC frames and trigger out-of-bounds reads in these handlers.

Fix this by using skb_pull_data() to validate and access the required data before dereferencing it.

rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows 1-byte RPN requests. Handle this by validating only the DLCI byte first, and validating the full struct only when len > 1.

CVSS Base Scores

version 3.1