8.1 High

CVE-2026-53254 In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC…

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.

Affected products and versions

Product	Affected versions	Fixed in
Linux 7.1	earliest → < 7.1	7.1
Linux 7.0	earliest → < 7.0.13	7.0.13
Linux 6.18	earliest → < 6.18.36	6.18.36
Linux 6.12	earliest → < 6.12.94	6.12.94
Linux 6.6	earliest → < 6.6.143	6.6.143
Linux 6.1	earliest → < 6.1.176	6.1.176
Linux 5.15	earliest → < 5.15.210	5.15.210
Linux	2.6.12	No fix stated
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	Versions not published