CVE-2026-90090
kernel: Bluetooth: btmtksdio: Fix out-of-bounds DMA read in the TX path
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 17, 2026
Updated · October 13, 2026
Description
A flaw was found in the Linux kernel's Bluetooth MTK SDIO (Secure Digital Input Output) driver. The btmtksdio_tx_packet() function, which handles data transmission, incorrectly calculates the transfer size. This leads to an out-of-bounds read of uninitialized memory, which is then sent to the Bluetooth device over the SDIO bus. A local attacker could potentially exploit this to disclose sensitive information.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-125 · Out-of-bounds Read