{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68382", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.387Z", "datePublished": "2026-08-10T12:04:01.187Z", "dateUpdated": "2026-08-17T05:04:28.645Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:04:28.645Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/guc: Hold device ref until queue teardown completes\n\nGuC exec queue destruction can run asynchronously. If the final device\nput happens from a destroy worker, drmm cleanup can end up draining\nthe same workqueue and deadlock.\n\nHold a drm_device reference for the queue lifetime and drop it after\nqueue teardown completes. This keeps drmm cleanup from running while\nasync destroy work is still pending.\n\nMove GuC destroy work to a module-lifetime Xe workqueue and flush it\non PCI remove so hot-unbind/rebind still waits for pending destroy work.\n\nWith queue-held device refs, guc_submit_sw_fini() cannot run with live\nGuC IDs. Replace the fini wait with an assertion and remove the unused\nfini_wq.\n\nv2:\n - Rebase\n\nv3:\n - Switch to queue-lifetime drm_dev_get()/drm_dev_put() model. (Matt)\n - Queue async teardown on system_dfl_wq instead of xe->destroy_wq. (Matt)\n - Drop separate deferred drm_dev_put worker.\n - Remove stale drain_workqueue(xe->destroy_wq) from guc_submit_sw_fini().\n\nv4:\n - Replace the guc_submit_sw_fini() wait with an assertion and remove\n the now-unused fini_wq. (sashiko)\n\nv5:\n - Move destroy work to a module-lifetime Xe workqueue instead of\n system_dfl_wq. (Matt)\n - Flush the module-lifetime destroy workqueue during PCI remove to\n preserve the old device-remove wait semantics.\n\nv6:\n - Keep SVM pagemap destroy work on the per-device destroy_wq to avoid\n letting it outlive the xe_device/drm_device. (Sashiko)\n - Use WQ_MEM_RECLAIM for xe->destroy_wq because SVM pagemap destroy work\n can be queued from the reclaim path.\n\nv7:\n - Drop the per-device xe->destroy_wq and use the module-level destroy WQ\n for SVM pagemap destroy as well. (Matt)\n - Rename xe_exec_queue_destroy_wq_*() helpers to xe_destroy_wq_*()\n helpers because the WQ is no longer exec-queue specific. (Matt)\n\nv8:\n - Rebase.\n\nv9:\n - Keep SVM pagemap destroy work on the per-device WQ_MEM_RECLAIM\n destroy_wq because it can be queued from reclaim and embeds\n the dev_pagemap used by devres teardown. (Sashiko)\n - Keep the module-level destroy WQ GuC-only and drop WQ_MEM_RECLAIM\n from it.\n - Update the module-WQ kdoc to document the GuC/SVM split.\n\nv10:\n - Keep xe->destroy_wq per-cpu while adding WQ_MEM_RECLAIM to fix the\n workqueue allocation warning.\n\nv11:\n - Drop the SVM pagemap destroy comment as it was revision-specific.\n (Thomas)\n\nv12:\n - Rebase.\n\n(cherry picked from commit da1124abac689cc2b1d8995e5f0a816f8a122edb)" } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable state is created through the Intel Xe DRM render node (/dev/dri/renderD*) via DRM_RENDER_ALLOW exec-queue create/destroy ioctls and manifests during local device teardown; no network or adjacent-network input is involved.\nAC:L - The attacker deterministically controls the decisive side of the race: GuC queue teardown blocks on a GuC deregister round-trip and cancel_delayed_work_sync() of the TDR, so long-running contexts with large preempt/job timeouts reliably keep exec_queue_lookup non-empty past guc_submit_sw_fini()'s fixed 5s wait, and the attempt can be repeated freely.\nPR:L - Exec queue creation and destruction are DRM_RENDER_ALLOW ioctls reachable by any unprivileged user holding an open render node, which is granted to logged-in users by default udev/ACL rules on systems with Intel GPUs; no capability or root privilege is needed to leave destroy work pending.\nUI:N - The attacker acts entirely on its own through render-node ioctls and GPU submission; no victim must open a file, mount a filesystem, or take any other action for the stale teardown state to be created.\nS:U - The corruption is confined to kernel memory managed by the same security authority as the xe driver; there is no VM escape, IOMMU/DMA boundary bypass, or other crossing into a different security scope.\nC:H - After the 5s wait times out (the assert is a no-op on production builds), drm_dev_release() kfree()s the whole xe_device while destroy work is pending, so the worker dereferences a freed slab object; the attacker can spray the reclaimed allocation and read back kernel data through the stale xe/guc pointers and xarray.\nI:H - The pending worker writes through the freed xe_device — xa_erase() on the destroyed lookup, mutex operations on submission_state.lock, and xe_guc_id_mgr_release_locked() bitmap updates — giving controlled writes into a reclaimed heap object and a path to control-flow hijack.\nA:H - Use-after-free on the freed device structure reliably oopses or panics the kernel; additionally the drain_workqueue() from a work item on the same destroy workqueue self-deadlocks, hanging device removal indefinitely." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/xe/xe_device.c", "drivers/gpu/drm/xe/xe_device_types.h", "drivers/gpu/drm/xe/xe_guc_submit.c", "drivers/gpu/drm/xe/xe_guc_types.h", "drivers/gpu/drm/xe/xe_module.c", "drivers/gpu/drm/xe/xe_module.h", "drivers/gpu/drm/xe/xe_pci.c" ], "versions": [ { "version": "2d2be279f1ca9e7288282d4214f16eea8a727cdb", "lessThan": "03d6f83979b0d75a0b0893dfe1735ec93facf515", "status": "affected", "versionType": "git" }, { "version": "2d2be279f1ca9e7288282d4214f16eea8a727cdb", "lessThan": "9b7e60184f4b22e893d4ae95234d5f26261a430c", "status": "affected", "versionType": "git" }, { "version": "272b0e78874586d6ccae04079d75b27b47705544", "status": "affected", "versionType": "git" }, { "version": "421c74670b0f9d5c007f1276d3647aa58f407fde", "status": "affected", "versionType": "git" }, { "version": "6.10.14", "lessThan": "6.11", "status": "affected", "versionType": "semver" }, { "version": "6.11.3", "lessThan": "6.12", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/xe/xe_device.c", "drivers/gpu/drm/xe/xe_device_types.h", "drivers/gpu/drm/xe/xe_guc_submit.c", "drivers/gpu/drm/xe/xe_guc_types.h", "drivers/gpu/drm/xe/xe_module.c", "drivers/gpu/drm/xe/xe_module.h", "drivers/gpu/drm/xe/xe_pci.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/03d6f83979b0d75a0b0893dfe1735ec93facf515" }, { "url": "https://git.kernel.org/stable/c/9b7e60184f4b22e893d4ae95234d5f26261a430c" } ], "title": "drm/xe/guc: Hold device ref until queue teardown completes", "x_generator": { "engine": "bippy-1.2.0" } } } }