CVE-2026-68298 drm/xe/vm: Fix SVM leak on resv obj alloc failure in xe_vm_create()
A memory leak in the Linux kernel's Xe GPU driver can lead to resource exhaustion and denial of service when VM creation fails.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68298?
CVE-2026-68298 is a high-severity denial of service vulnerability in Linux, published on 10 Aug 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/xe/vm: Fix SVM leak on resv obj alloc failure in xe_vm_create()
Commit 9e9787414882 ("drm/xe/userptr: replace xe_hmm with gpusvm") made xe_svm_init() unconditional in xe_vm_create() and extended it to also initialize a "simple" gpusvm state for non-fault-mode VMs. The matching xe_svm_fini() call in xe_vm_close_and_put() was updated to run unconditionally, but the error unwind path in xe_vm_create() was not.
On the drm_gpuvm_resv_object_alloc() failure path, xe_svm_init() has already succeeded but xe_svm_fini() is only called when XE_VM_FLAG_FAULT_MODE is set. For non-fault-mode VMs this leaves vm->svm.gpusvm partially initialized and leaks the resources allocated by drm_gpusvm_init().
For fault-mode VMs, xe_svm_init() additionally acquires the pagemap owner via drm_pagemap_acquire_owner() and the pagemaps via xe_svm_get_pagemaps(). Those resources are released by xe_svm_close(), not xe_svm_fini(). On the same error path, xe_svm_close() is not called either, so fault-mode VMs leak the pagemap owner and pagemaps.
Fix both leaks:
- Call xe_svm_fini() unconditionally on the err_svm_fini path, matching the unconditional xe_svm_init() call. Move the vm->size = 0 assignment out of the conditional so the xe_vm_is_closed() assert in xe_svm_fini() (and xe_svm_close()) holds for both modes.
- Call xe_svm_close() for fault-mode VMs before xe_svm_fini(), matching the ordering used in xe_vm_close_and_put().
(cherry picked from commit ca2a3587d577ba764e0fe628fb676244fc33ddd4)
Weakness: CWE-401
Which versions are affected by CVE-2026-68298?
How do I fix CVE-2026-68298?
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-2026-68298 being exploited?
There is no known exploitation of CVE-2026-68298 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68298, DEBIAN-CVE-2026-68298, GHSA-w7rf-7rxm-hr7v, UBUNTU-CVE-2026-68298.