CVE-2026-63885

Published: July 22, 2026Last modified: July 22, 2026

Description

In the Linux kernel, the following vulnerability has been resolved: drm/gem: fix race between change_handle and handle_delete drm_gem_change_handle_ioctl leaves the old handle live in the IDR during the window between spin_unlock(table_lock) and the final spin_lock(table_lock). A concurrent drm_gem_handle_delete on the old handle succeeds in this window, decrements handle_count to 0, and frees the GEM object while the new handle's IDR entry still references it. NULL the old handle's IDR entry before dropping table_lock so that any concurrent GEM_CLOSE on the old handle sees NULL and returns -EINVAL. Restore the old entry on the prime-bookkeeping error path.

Severity score breakdown

Status

References

• https://git.kernel.org/stable/c/0dfa42cfe4dbe114533480503934f43e33c1e83d
• https://git.kernel.org/stable/c/7164d78559b0ff29931a366a840a9e5dd53d4b7c
• https://git.kernel.org/stable/c/cde2c9257cbe8463b9dcf7b1075177b72b5fd938