CVE-2026-53254

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7c15c7c2878957cbfed93bcc29c13fdace464254affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0d637136ce89f9a2309b2c3502402ce400dab0efaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 98377e6b1a1a56561ec66a181573ea2b61b2079eaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10caffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3eabc6d47a0ad22b053329997aaf0ec1e581e392affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 23882b828c3c8c51d0c946446a396b10abb3b16baffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References