CVE-2026-23149 drm: Do not allow userspace to trigger kernel warnings in drm_gem_change_handle_ioctl()

What is CVE-2026-23149?

CVE-2026-23149 is a medium-severity denial of service vulnerability in Linux kernel, published on 14 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Which versions are affected by CVE-2026-23149?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-23149?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-23149 being exploited?

There is no known exploitation of CVE-2026-23149 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-23149, DEBIAN-CVE-2026-23149, GHSA-f36v-x2cg-pr97, UBUNTU-CVE-2026-23149.