Use-after-free in Linux kernel - CVE-2026-90423
Published: September 18, 2026
Vulnerability identifier: #VU151061
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-2026-90423
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a use-after-free condition.
The vulnerability exists due to use-after-free in the rxe_odp_mr_init_user() error-handling path when initializing on-demand paging memory regions. A local user can invoke user memory-region registration during an on-demand paging initialization error to trigger a use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-90423
Install security update from vendor's repository.