CVE-2025-68193 drm/xe/guc: Add devm release action to safely tear down CT
A use-after-free in the Linux kernel's Xe GPU driver allows local attackers to cause a system crash via premature buffer release.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68193?
CVE-2025-68193 is an use after free vulnerability in Linux, published on 16 Dec 2025. 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/guc: Add devm release action to safely tear down CT
When a buffer object (BO) is allocated with the XE_BO_FLAG_GGTT_INVALIDATE flag, the driver initiates TLB invalidation requests via the CTB mechanism while releasing the BO. However a premature release of the CTB BO can lead to system crashes, as observed in:
Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:h2g_write+0x2f3/0x7c0 [xe] Call Trace: guc_ct_send_locked+0x8b/0x670 [xe] xe_guc_ct_send_locked+0x19/0x60 [xe] send_tlb_invalidation+0xb4/0x460 [xe] xe_gt_tlb_invalidation_ggtt+0x15e/0x2e0 [xe] ggtt_invalidate_gt_tlb.part.0+0x16/0x90 [xe] ggtt_node_remove+0x110/0x140 [xe] xe_ggtt_node_remove+0x40/0xa0 [xe] xe_ggtt_remove_bo+0x87/0x250 [xe]
Introduce a devm-managed release action during xe_guc_ct_init() and xe_guc_ct_init_post_hwconfig() to ensure proper CTB disablement before resource deallocation, preventing the use-after-free scenario.
Which versions are affected by CVE-2025-68193?
How do I fix CVE-2025-68193?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-68193 being exploited?
There is no known exploitation of CVE-2025-68193 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68193, DEBIAN-CVE-2025-68193, GHSA-rcqc-4q5v-hpcm, ROOT-OS-DEBIAN-13-CVE-2025-68193, ROOT-OS-UBUNTU-2204-CVE-2025-68193, ROOT-OS-UBUNTU-2404-CVE-2025-68193 and 1 more.