PT-2026-52350 · Linux · Linux

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-53255

Mitre

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

Bluetooth: MGMT: validate advertising TLV before type checks

tlv data is 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 MGMT OP ADD ADVERTISING request reached that path:

BUG: KASAN: vmalloc-out-of-bounds in tlv data is valid() Read of size 1 Call trace: tlv data is valid() add advertising() hci mgmt cmd() hci sock 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].

Related Identifiers

CVE-2026-53255

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-53255 · Security Note
• https://git.kernel.org/stable/c/f7093ac233c1e7f51d125534f46067772a113175 · Note
• https://git.kernel.org/stable/c/74c08e4db35a476c3462aeb65846f955be732626 · Note
• https://git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080 · Note
• https://git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413 · Note
• https://git.kernel.org/stable/c/2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57 · Note
• https://git.kernel.org/stable/c/1a3c8ffbb469859b076445af44bdfa6a711d483e · Note
• https://git.kernel.org/stable/c/18fea1cb0c2599752e908c8217490f73ddd33e00 · Note
• https://git.kernel.org/stable/c/06fcbd79c3c360a50f9be9d370769bbd738d0976 · Note