# CVE-2025-68193: drm/xe/guc: Add devm release action to safely tear down CT

CVE-2025-68193 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68193, released December 16, 2025. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2025-68193
- Priority: Urgent
- CVSS: n/a (Critical)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 16, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68193

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2025-68193](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68193.md) | Dec 16, 2025 |
| Linux | linux Debian 14 | 6.17.8-1 | [DEBIAN-CVE-2025-68193](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68193.md) | Dec 16, 2025 |

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