{"id":"CVE-2026-80606","title":"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() wit…","summary":"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() wit…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","published":"2026-08-28","updated":"2026-08-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80606","references":[{"url":"https://git.kernel.org/stable/c/ab9ea5c943c7e780124e75b7ffad9f1c752b2579","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dca6e08c923a44d2d66b955e03dd57a3a38c2b94","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f9a9abd7bbdab3dfe1b1155e1457dc02b5e14ea5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00135,"epssPercentile":0.0336,"ingestedAt":"2026-08-29T22:43:16.199Z","slug":"CVE-2026-80606","body":"## Overview\n\nIn 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)\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}