CVE-2026-52976

In the Linux kernel, the following vulnerability has been resolved:

drm/xe: Fix error cleanup in xe_exec_queue_create_ioctl()

Two error handling issues exist in xe_exec_queue_create_ioctl():

1. When xe_hw_engine_group_add_exec_queue() fails, the error path jumps to put_exec_queue which skips xe_exec_queue_kill(). If the VM is in preempt fence mode, xe_vm_add_compute_exec_queue() has already added the queue to the VMs compute exec queue list. Skipping the kill leaves the queue on that list, leading to a dangling pointer after the queue is freed.

2. When xa_alloc() fails after xe_hw_engine_group_add_exec_queue() has succeeded, the error path does not call xe_hw_engine_group_del_exec_queue() to remove the queue from the hw engine group list. The queue is then freed while still linked into the hw engine group, causing a use-after-free.

Fix both by:

• Changing the xe_hw_engine_group_add_exec_queue() failure path to jump to kill_exec_queue so that xe_exec_queue_kill() properly removes the queue from the VMs compute list.
• Adding a del_hw_engine_group label before kill_exec_queue for the xa_alloc() failure path, which removes the queue from the hw engine group before proceeding with the rest of the cleanup.

(cherry picked from commit 37c831f401746a45d510b312b0ed7a77b1e06ec8)

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/1be55646d8a2035343b012dcb12210db7bb8b056
• https://git.kernel.org/stable/c/753b149d5a433eb19e0c1b0eb4526a6e26120d1f
• https://git.kernel.org/stable/c/f3cc22d4df3ed58439ea7e21daa54c3608e03b78
• https://git.kernel.org/stable/c/f93b00161213a0fe9f7ff1d8498ee5ca9e0a5c43
• https://access.redhat.com/security/cve/CVE-2026-52976
• https://bugzilla.redhat.com/show_bug.cgi?id=2492284
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52976.json