{"id":"CVE-2026-98391","title":"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 w…","summary":"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 w…","severity":"medium","published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:49.980","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98391","references":[{"url":"https://git.kernel.org/stable/c/20fce5b34b21a995839743b4917a1edd2fd503ba","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/25764620ec64c0142e2c87c41787f45540cf09ff","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98391.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98391"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552226"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98391"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98391"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98391.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-14T15:36:13.977Z","vendor":"Linux","product":"Linux","affected":["Linux >= f289f7807119128d4f9d59f34ac557549c7562e5 < 25764620ec64c0142e2c87c41787f45540cf09ff","Linux >= f289f7807119128d4f9d59f34ac557549c7562e5 < 20fce5b34b21a995839743b4917a1edd2fd503ba","Linux 6.19"],"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-617"],"epss":0.00189,"epssPercentile":0.08508,"slug":"CVE-2026-98391","body":"## Overview\n\nIn 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]\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98391.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224113,"id":"CVE-2026-98391","ts":1792324925963,"field":"cvss","old":null,"new":"5.5"},{"seq":224112,"id":"CVE-2026-98391","ts":1792324925963,"field":"severity","old":"none","new":"medium"}]}