CVE-2025-40166
Full vulnerability record from the local CVENow database.
Description
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)
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-11-12 11:15:46.880000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-40166",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-11-12T11:15:46.880",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/guc: Check GuC running state before deregistering exec queue\n\nIn normal operation, a registered exec queue is disabled and\nderegistered through the GuC, and freed only after the GuC confirms\ncompletion. However, if the driver is forced to unbind while the exec\nqueue is still running, the user may call exec_destroy() after the GuC\nhas already been stopped and CT communication disabled.\n\nIn this case, the driver cannot receive a response from the GuC,\npreventing proper cleanup of exec queue resources. Fix this by directly\nreleasing the resources when GuC is not running.\n\nHere is the failure dmesg log:\n\"\n[ 468.089581] ---[ end trace 0000000000000000 ]---\n[ 468.089608] pci 0000:03:00.0: [drm] *ERROR* GT0: GUC ID manager unclean (1/65535)\n[ 468.090558] pci 0000:03:00.0: [drm] GT0: total 65535\n[ 468.090562] pci 0000:03:00.0: [drm] GT0: used 1\n[ 468.090564] pci 0000:03:00.0: [drm] GT0: range 1..1 (1)\n[ 468.092716] ------------[ cut here ]------------\n[ 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]\n\"\n\nv2: use xe_uc_fw_is_running() instead of xe_guc_ct_enabled().\n As CT may go down and come back during VF migration.\n\n(cherry picked from commit 9b42321a02c50a12b2beb6ae9469606257fbecea)"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe/guc: Verificar el estado de ejecución de GuC antes de anular el registro de la cola de ejecución\n\nEn operación normal, una cola de ejecución registrada se deshabilita y se anula su registro a través del GuC, y se libera solo después de que el GuC confirma la finalización. Sin embargo, si el controlador se ve obligado a desvincularse mientras la cola de ejecución aún está en ejecución, el usuario puede llamar a exec_destroy() después de que el GuC ya se haya detenido y la comunicación CT se haya deshabilitado.\n\nEn este caso, el controlador no puede recibir una respuesta del GuC, lo que impide una limpieza adecuada de los recursos de la cola de ejecución. Solucione esto liberando directamente los recursos cuando GuC no está en ejecución.\n\nAquí está el registro dmesg del fallo:\n“\n[ 468.089581] ---[ end trace 0000000000000000 ]---\n[ 468.089608] pci 0000:03:00.0: [drm] *ERROR* GT0: GUC ID manager unclean (1/65535)\n[ 468.090558] pci 0000:03:00.0: [drm] GT0: total 65535\n[ 468.090562] pci 0000:03:00.0: [drm] GT0: used 1\n[ 468.090564] pci 0000:03:00.0: [drm] GT0: range 1..1 (1)\n[ 468.092716] ------------[ cut here ]------------\n[ 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]\n”\n\nv2: usar xe_uc_fw_is_running() en lugar de xe_guc_ct_enabled().\n Ya que CT puede caerse y volver durante la migración de VF.\n\n(seleccionado de la confirmación 9b42321a02c50a12b2beb6ae9469606257fbecea)"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/gpu/drm/xe/xe_guc_submit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
"lessThan": "2c6e5904c5bdbac8e0eadee40f70c42bb83f6dc6",
"versionType": "git",
"status": "affected"
},
{
"version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
"lessThan": "fa708415566bbe5361c935645107319f8edc8dc1",
"versionType": "git",
"status": "affected"
},
{
"version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
"lessThan": "9f64b3cd051b825de0a2a9f145c8e003200cedd5",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/gpu/drm/xe/xe_guc_submit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.8",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.55",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.5",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2c6e5904c5bdbac8e0eadee40f70c42bb83f6dc6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9f64b3cd051b825de0a2a9f145c8e003200cedd5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fa708415566bbe5361c935645107319f8edc8dc1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}