sched_ext: Disable preemption between scx_claim_exit() and kicking helper work

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-43482
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-13 16:16:51 UTC
Updated2026-05-13 16:16:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Disable preemption between scx_claim_exit() and kicking helper work scx_claim_exit() atomically sets exit_kind, which prevents scx_error() from triggering further error handling. After claiming exit, the caller must kick the helper kthread work which initiates bypass mode and teardown. If the calling task gets preempted between claiming exit and kicking the helper work, and the BPF scheduler fails to schedule it back (since error handling is now disabled), the helper work is never queued, bypass mode never activates, tasks stop being dispatched, and the system wedges. Disable preemption across scx_claim_exit() and the subsequent work kicking in all callers - scx_disable() and scx_vexit(). Add lockdep_assert_preemption_disabled() to scx_claim_exit() to enforce the requirement.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f0e1a0643a59bf1f922fa209cec86a170b784f3f 41423912f7ac7494ccd6eef411227b4efce740e0 git Not specified
CNA Linux Linux affected f0e1a0643a59bf1f922fa209cec86a170b784f3f 522acaae34aa7e05859260056b39c7c030592a0c git Not specified
CNA Linux Linux affected f0e1a0643a59bf1f922fa209cec86a170b784f3f 5131dbec2c10961b34f844bc30b400c3fa0bcc72 git Not specified
CNA Linux Linux affected f0e1a0643a59bf1f922fa209cec86a170b784f3f 83236b2e43dba00bee5b82eb5758816b1a674f6a git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83236b2e43dba00bee5b82eb5758816b1a674f6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report