Use-after-free in Linux kernel - CVE-2026-90256
Published: September 18, 2026
Vulnerability identifier: #VU151234
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90256
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in the Bluetooth L2CAP l2cap_disconn_ind function when processing concurrent L2CAP connection deletion. A remote attacker can trigger concurrent L2CAP disconnection processing to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90256
Install security update from vendor's repository.