Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-05-28T00:00:00 kernel: drm: Set old handle to NULL before prime swap in change_handle 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-825

In the Linux kernel, the following vulnerability has been resolved: drm: Set old handle to NULL before prime swap in change_handle There was a potential race condition in change_handle. The ioctl briefly had a single object with two idr entries; a concurrent gem_close could delete the object and remove one of the handles while leaving the other one dangling, which could subsequently be dereferenced for a use-after-free. To fix this, do the same dance that gem_close itself does. (f6cd7daecff5 drm: Release driver references to handle before making it available again) First idr_replace the old handle to NULL. Later, if the prime operations are successful, actually close it. create_tail required a similar dance to avoid a similar problem. (bd46cece51a3 drm/gem: Fix race in drm_gem_handle_create_tail()) It idr_allocs the new handle with NULL, then swaps in the correct object later to avoid races. We don't need to do that here, since the only operations that could race are drm_prime, and change_handle holds the prime lock for the entire duration. v2: cleanups of error paths

A flaw was found in the Linux kernel. A race condition in the Direct Rendering Manager (DRM) subsystem's `change_handle` function could allow a local attacker to trigger a use-after-free vulnerability. This occurs when a concurrent `gem_close` operation removes one handle while another remains dangling. Successful exploitation of this flaw could lead to arbitrary code execution or privilege escalation.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Under investigation kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-46215 https://nvd.nist.gov/vuln/detail/CVE-2026-46215 https://lore.kernel.org/linux-cve-announce/2026052836-CVE-2026-46215-4ede@gregkh/T