CVE-2026-53254 Bluetooth: RFCOMM: validate skb length in MCC handlers
A malicious remote device can send truncated Bluetooth RFCOMM frames to trigger out-of-bounds reads in the Linux kernel, potentially causing crashes or data leaks.
- 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-2026-53254?
CVE-2026-53254 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Jun 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: 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-53254?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53254?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-53254 being exploited?
There is no known exploitation of CVE-2026-53254 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90917, BELL-CVE-2026-53254, DEBIAN-CVE-2026-53254, GHSA-v722-58f9-vcj4, ROOT-OS-DEBIAN-11-CVE-2026-53254, ROOT-OS-DEBIAN-12-CVE-2026-53254 and 3 more.