{"id":"CVE-2026-98391","summary":"drm/xe: Guard page-fault worker with runtime PM check","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Guard page-fault worker with runtime PM check\n\nDuring VM teardown, the VM's runtime PM reference is dropped\nasynchronously, allowing the device to autosuspend while stale page\nfaults belonging to the now-dead VM are still queued. When the\npage-fault worker later tries to ack one of these, it calls into\nguc_ct_send_locked() on an already-suspended device, tripping:\n\n  Assertion `!xe_pm_runtime_suspended(xe)` failed!\n  WARNING at xe_device.c:1267 xe_device_assert_mem_access+0x11c/0x140 [xe]\n\nA live VM/exec queue always holds a PM reference while it has\noutstanding work, so if the device is suspended at ack time, the\nowning context is already gone and the fault is stale.\n\nTake a runtime PM reference across the entire pagefault\nqueue worker to safely deliver acks for torn-down VMs.\n\nv3:\n - Move PM ref to the generic xe_pagefault_queue_work using\n   guard(xe_pm_runtime)(xe) instead of tracking it in the GuC\n   backend(Matt Brost).\n\nv2:\n - Hold PM ref across the entire batch (begin/end) instead of per-ack.\n   This prevents the device from autosuspending mid-batch, which would\n   leave write_only acks written but the end flush skipped, and skip\n   counter++, desyncing the cadence check.(Himal)\n - Add a comment explaining stale faults.(Himal)\n\n(cherry picked from commit fcc2431d2213dc4d04250c4f1ae87d9c3ae0d455)\n[Rodrigo: Added xe_device struct for compatibility while cherry-picking]","modified":"2026-10-15T02:47:45.223481354Z","published":"2026-10-14T13:25:55.498Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98391.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/20fce5b34b21a995839743b4917a1edd2fd503ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/25764620ec64c0142e2c87c41787f45540cf09ff"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98391.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98391"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f289f7807119128d4f9d59f34ac557549c7562e5"},{"fixed":"25764620ec64c0142e2c87c41787f45540cf09ff"},{"fixed":"20fce5b34b21a995839743b4917a1edd2fd503ba"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98391.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98391.json"}}],"schema_version":"1.9.0"}