CVE-2026-52976drm/xe: Fix error cleanup in xe_exec_queue_create_ioctl()

Official description

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 VM's 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 VM's 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)

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/f93b00161213a0fe9f7ff1d8498ee5ca9e0a5c43
• https://git.kernel.org/stable/c/753b149d5a433eb19e0c1b0eb4526a6e26120d1f
• https://git.kernel.org/stable/c/1be55646d8a2035343b012dcb12210db7bb8b056
• https://git.kernel.org/stable/c/f3cc22d4df3ed58439ea7e21daa54c3608e03b78
• https://access.redhat.com/security/cve/CVE-2026-52976 vdb-entry, x_refsource_REDHAT
• RHBZ#2492284 issue-tracking, x_refsource_REDHAT
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52976.json x_sadp-csaf-vex
• https://access.redhat.com/errata/RHSA-2026:52764 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:42919 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:52667 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:45192 vendor-advisory, x_refsource_REDHAT