CVE-2026-53254

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.

References

• https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997
• https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef
• https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c
• https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b
• https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392