Summary
In the Linux kernel, the following vulnerability has been resolved: drm/xe/guc: Check GuC...
In the Linux kernel, the following vulnerability has been resolved:
drm/xe/guc: Check GuC running state before deregistering exec queue
In normal operation, a registered exec queue is disabled and
deregistered through the GuC, and freed only after the GuC confirms
completion. However, if the driver is forced to unbind while the exec
queue is still running, the user may call exec_destroy() after the GuC
has already been stopped and CT communication disabled.
In this case, the driver cannot receive a response from the GuC,
preventing proper cleanup of exec queue resources. Fix this by directly
releasing the resources when GuC is not running.
Here is the failure dmesg log:
"
[ 468.089581] ---[ end trace 0000000000000000 ]---
[ 468.089608] pci 0000:03:00.0: [drm] ERROR GT0: GUC ID manager unclean (1/65535)
[ 468.090558] pci 0000:03:00.0: [drm] GT0: total 65535
[ 468.090562] pci 0000:03:00.0: [drm] GT0: used 1
[ 468.090564] pci 0000:03:00.0: [drm] GT0: range 1..1 (1)
[ 468.092716] ------------[ cut here ]------------
[ 468.092719] WARNING: CPU: 14 PID: 4775 at drivers/gpu/drm/xe/xe_ttm_vram_mgr.c:298 ttm_vram_mgr_fini+0xf8/0x130 [xe]
"
v2: use xe_uc_fw_is_running() instead of xe_guc_ct_enabled().
As CT may go down and come back during VF migration.
(cherry picked from commit 9b42321a02c50a12b2beb6ae9469606257fbecea)
Impact
CVE-2025-40166 has a CVSS score of 7.8 (High). The vector is requires local access, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Already deployed Kodem?
See it in your environmentNew to Kodem? Get a demo →Remediation advice
Frequently Asked Questions
- What is CVE-2025-40166? CVE-2025-40166 is a high-severity security vulnerability. No fixed version is listed yet.
- How severe is CVE-2025-40166? CVE-2025-40166 has a CVSS score of 7.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Is there a fix for CVE-2025-40166? No fixed version is listed for CVE-2025-40166 yet. Monitor the advisory for updates and apply mitigations in the interim.
- Is CVE-2025-40166 exploitable, and should I be worried? Whether CVE-2025-40166 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2025-40166 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.