Out-of-bounds read in Linux kernel - CVE-2026-46138
Published: May 29, 2026
Vulnerability identifier: #VU133054
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-46138
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in hci_le_create_big_complete_evt when processing a crafted LE_Create_BIG_Complete event. A remote attacker can send a specially crafted Bluetooth controller event to cause a denial of service.
The issue can also result in an infinite loop while hci_dev_lock is held when the event contains fewer bis_handle entries than expected or num_bis is zero.
How to mitigate CVE-2026-46138
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17
- https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586
- https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774
- https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd
- https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17