{"id":"CVE-2026-89519","title":"kernel: sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return (CVE-2026-89519)","summary":"A flaw was found in the Linux kernel's `sched_ext` component. Due to a logical error where a stale flag (`SCX_RQ_BAL_KEEP`) could be consumed, the scheduler might incorrectly keep a task running even after it has been dequeued. This could …","severity":"medium","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-367","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T04:58:57+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89519.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89519.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89519"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532339"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89519"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89519"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89519.mbox"},{"url":"https://git.kernel.org/stable/c/6f1d3bfe54430f8d54e0530a27f2ecbf8466576e"},{"url":"https://git.kernel.org/stable/c/ffaab58d217581cb75353168f8812a16e10463fc"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00189,"epssPercentile":0.08819,"ingestedAt":"2026-09-14T11:11:19.886Z","slug":"CVE-2026-89519","body":"## Overview\n\nA flaw was found in the Linux kernel's `sched_ext` component. Due to a logical error where a stale flag (`SCX_RQ_BAL_KEEP`) could be consumed, the scheduler might incorrectly keep a task running even after it has been dequeued. This could lead to unexpected task management behavior within the kernel.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89519.json)\n\n**kernel: sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203994,"id":"CVE-2026-89519","ts":1789490230961,"field":"cvss","old":null,"new":"5.5"},{"seq":203993,"id":"CVE-2026-89519","ts":1789490230961,"field":"severity","old":"none","new":"medium"},{"seq":147355,"id":"CVE-2026-89519","ts":1789270210581,"field":"cvss","old":null,"new":"5.5"},{"seq":147354,"id":"CVE-2026-89519","ts":1789270210581,"field":"severity","old":"none","new":"medium"},{"seq":109108,"id":"CVE-2026-89519","ts":1789183730334,"field":"cvss","old":null,"new":"5.5"},{"seq":109107,"id":"CVE-2026-89519","ts":1789183730334,"field":"severity","old":"none","new":"medium"}]}