Medium [CVE-2026-89518] `sched_ext` deadlock due to incorrect `this_rq ` assumptions
This medium-severity Red Hat Linux advisory covers CVE-2026-89518 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the Linux kernel's `sched_ext` component. Under core scheduling, incorrect assumptions in dispatch kfuncs regarding `this_rq()` can lead to a deadlock.
This occurs when an `rq` lock is acquired on a CPU different from the dispatched `rq`'s, potentially causing the system to become unresponsive. This vulnerability could result in a Denial of Service (DoS).
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-833.
Affected Red Hat products: Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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