Use-after-free in Linux kernel - CVE-2026-90093
Published: September 19, 2026
Vulnerability identifier: #VU151395
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90093
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the L2CAP get/setsockopt handlers in net/bluetooth/l2cap_sock.c when accessing socket options during HCI connection teardown. A local user can invoke L2CAP get/setsockopt operations during connection teardown to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90093
Install security update from vendor's repository.