CVE-2026-53255

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: validate advertising TLV before type checks

tlvdatais_valid() reads each advertising data field length from data[i], then inspects data[i + 1] for managed EIR types before checking that the current field still fits inside the supplied buffer.

A malformed field whose length byte is the last byte of the buffer can therefore make the parser read one byte past the advertising data.

KASAN reported the following when a malformed MGMTOPADD_ADVERTISING request reached that path:

BUG: KASAN: vmalloc-out-of-bounds in tlvdataisvalid() Read of size 1 Call trace: tlvdataisvalid() addadvertising() hcimgmtcmd() hcisock_sendmsg()

Move the existing element-length check before any type-octet inspection so each non-empty element is proven to contain its type byte before the parser looks at data[i + 1].