Use-after-free in Linux kernel - CVE-2026-90210
Published: September 18, 2026
Vulnerability identifier: #VU151268
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90210
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 use-after-free condition.
The vulnerability exists due to use-after-free in bpf_trampoline_multi_attach_free when a BPF trampoline update fails before multi-attach fentry modification or unregistration. A local user can trigger the failed update to cause a use-after-free condition.
In this condition, ftrace can still call the old image.
Affected software
Linux kernel
How to mitigate CVE-2026-90210
Install security update from vendor's repository.