{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80606", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.772Z", "datePublished": "2026-08-28T06:48:30.960Z", "dateUpdated": "2026-10-16T19:26:30.365Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:21:16.890Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/userptr: Hold notifier_lock for write on inject test path\n\nWhen CONFIG_DRM_XE_USERPTR_INVAL_INJECT=y, xe_pt_svm_userptr_pre_commit()\nruns vma_check_userptr() with the svm notifier_lock taken for read. The\ntest injection causes vma_check_userptr() to call\nxe_vma_userptr_force_invalidate(), which feeds into\nxe_vma_userptr_do_inval() with drm_gpusvm_ctx.in_notifier=true. That\nflag tells drm_gpusvm_unmap_pages() the caller already holds\nnotifier_lock for write and only asserts the mode. Because the caller\nactually holds it for read, the assertion fires:\n\n WARNING: drivers/gpu/drm/drm_gpusvm.c:1669 at \\\n drm_gpusvm_unmap_pages+0xd4/0x130 [drm_gpusvm_helper]\n Call Trace:\n xe_vma_userptr_do_inval+0x40d/0xfd0 [xe]\n xe_vma_userptr_invalidate_pass1+0x3e6/0x8d0 [xe]\n xe_vma_userptr_force_invalidate+0xde/0x290 [xe]\n vma_check_userptr.constprop.0+0x1c6/0x220 [xe]\n xe_pt_svm_userptr_pre_commit+0x6a3/0xc60 [xe]\n ...\n xe_vm_bind_ioctl+0x3a0a/0x4480 [xe]\n\nAcquire notifier_lock for write in pre-commit when the inject Kconfig\nis enabled, via new helpers xe_pt_svm_userptr_notifier_lock()/_unlock().\nRename xe_svm_assert_held_read() to\nxe_svm_assert_held_read_or_inject_write() so it asserts the correct\nmode under each build configuration. Production builds\n(CONFIG_DRM_XE_USERPTR_INVAL_INJECT=n) keep the existing read-mode\nbehavior bit-for-bit.\n\n(cherry picked from commit 80ccbd97ffee8ad2e73167d826fe7be548364365)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only through DRM_IOCTL_XE_VM_BIND on a local /dev/dri/renderD* character device; there is no network, adjacent-radio, or physical-bus attack surface on this code path.\nAC:H - Exploitation requires CONFIG_DRM_XE_USERPTR_INVAL_INJECT=y (debug-only Kconfig default n), Intel Xe hardware with drm/xe loaded, and CONFIG_DRM_GPUSVM—rare non-default conditions beyond typical attacker control on production systems.\nPR:L - Any unprivileged local user who can open the DRM render node can create a VM and issue XE_VM_BIND userptr map/remap operations to drive the inject path; root or init-namespace admin rights are not required.\nUI:N - Exploitation requires only attacker-issued GPU bind ioctls against their own VM; no victim user or administrator must perform any separate action.\nS:C - The racy unmap tears down IOMMU/DMA mappings without exclusive notifier_lock, allowing the GPU to access host memory outside the attacker's intended userptr mapping and crossing the device/kernel memory isolation boundary.\nC:H - Concurrent drm_gpusvm_unmap_pages() under a read notifier_lock races with other userptr/SVM accessors, enabling use-after-free of GPU SVM page state and arbitrary kernel memory disclosure.\nI:H - Unsafe concurrent DMA unmap and pagemap teardown corrupts GPU SVM mapping metadata under weak locking, which can be leveraged for controlled kernel memory writes and code execution.\nA:H - The bug triggers a kernel WARNING/oops via lockdep_assert_held_write() in drm_gpusvm_unmap_pages() and can panic or wedge the Xe driver from unsafe concurrent userptr invalidation." } ] } ], "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_pt.c", "drivers/gpu/drm/xe/xe_svm.h" ], "versions": [ { "version": "9e978741488261e117bb50e5dfcf8e4080990958", "lessThan": "f9a9abd7bbdab3dfe1b1155e1457dc02b5e14ea5", "status": "affected", "versionType": "git" }, { "version": "9e978741488261e117bb50e5dfcf8e4080990958", "lessThan": "ab9ea5c943c7e780124e75b7ffad9f1c752b2579", "status": "affected", "versionType": "git" }, { "version": "9e978741488261e117bb50e5dfcf8e4080990958", "lessThan": "dca6e08c923a44d2d66b955e03dd57a3a38c2b94", "status": "affected", "versionType": "git" } ] }, { "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_pt.c", "drivers/gpu/drm/xe/xe_svm.h" ], "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "6.18", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f9a9abd7bbdab3dfe1b1155e1457dc02b5e14ea5" }, { "url": "https://git.kernel.org/stable/c/ab9ea5c943c7e780124e75b7ffad9f1c752b2579" }, { "url": "https://git.kernel.org/stable/c/dca6e08c923a44d2d66b955e03dd57a3a38c2b94" } ], "title": "drm/xe/userptr: Hold notifier_lock for write on inject test path", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80606", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:18:38.354665Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:30.365Z" } } ] } }