CVE-2026-53254
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk20th percentile — higher than 20% of all known CVEs
Summary
In the Linux kernel, a vulnerability in Bluetooth RFCOMM MCC handlers fails to validate skb length before accessing data. A remote attacker can send truncated MCC frames, triggering out-of-bounds reads.
Risk Assessment
An attacker can remotely cause sensitive data leaks or system crashes (kernel panic) by sending crafted Bluetooth RFCOMM frames.
Recommendation
Immediately update the Linux kernel to a version containing the fix that uses skb_pull_data() to validate frame length before data access.
Original NVD description (English source)
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.