{"id":"CVE-2026-90432","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Abort directly from the hardlockup handler\n\nscx_hardlockup() defers the abort to an irq_work because exit claiming used\nto take scx_sched_lock and couldn't r…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Abort directly from the hardlockup handler\n\nscx_hardlockup() defers the abort to an irq_work because exit claiming used\nto take scx_sched_lock and couldn't r…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= bd2d76455b65aab77652823919db128a8e585825 < 4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed","Linux >= bd2d76455b65aab77652823919db128a8e585825 < 3c4b38064937a761ebbf85b1649e812db85eb59e","Linux 7.1"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:48.263","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90432","references":[{"url":"https://git.kernel.org/stable/c/3c4b38064937a761ebbf85b1649e812db85eb59e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90432.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90432"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536354"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90432"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90432"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90432.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.791Z","epss":0.00198,"epssPercentile":0.09428,"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-253"],"slug":"CVE-2026-90432","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Abort directly from the hardlockup handler\n\nscx_hardlockup() defers the abort to an irq_work because exit claiming used\nto take scx_sched_lock and couldn't run from NMI. The deferral is now\nunnecessary - claiming is NMI-safe and asserting ->aborting is exactly what\nbreaks the live-locks that hard-lock CPUs. Call handle_lockup() directly and\ndrop the irq_work. This also makes the self-detected case recoverable: the\nperf watchdog fires on the hard-locked CPU itself, where a queued irq_work\nnever runs with IRQs off.\n\nAlso fix the return value: %true used to be returned whenever sched_ext was\nloaded, suppressing the kernel's hardlockup report even when the abort was\nrefused. Return %true only when this call initiated the abort.\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** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90432.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225581,"id":"CVE-2026-90432","ts":1792498303207,"field":"cvss","old":null,"new":"5.5"},{"seq":225580,"id":"CVE-2026-90432","ts":1792498303207,"field":"severity","old":"none","new":"medium"}]}