CVE-2026-23149: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: drm: Do not allow userspace to trigger kernel warnings in drm_gem_change_handle_ioctl() Since GEM bo handles are u32 in the uapi and the internal implementation uses idr_alloc() which uses int ranges, passing a new handle larger than INT_MAX trivially triggers a kernel warning: idr_alloc(): ... if (WARN_ON_ONCE(start < 0)) return -EINVAL; ... Fix it by rejecting new handles above INT_MAX and at the same time make the end limit calculation more obvious by moving into int domain.

Affected products

• Linux Linux Kernel: from 6.18, before 6.18.9 (fixed in 6.18.9); version 6.19 only

Published 2026-02-14. Last modified 2026-06-17.