CVE-2026-43482
In 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.
Affected versions
Linux kernel versions
6.12
and later are affected. Fixed in
6.12.78,
6.18.20,
6.19.9,
7.0
and their respective stable series.
References
The following references provide additional information about CVE-2026-43482 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0
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PatchKernel patch commithttps://git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72
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PatchKernel patch commithttps://git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c
Frequently asked questions
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What is CVE-2026-43482?
CVE-2026-43482 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.12 onward and has been patched in 6.12.78, 6.18.20, 6.19.9 and others. CVE-2026-43482 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-43482?
Yes — CVE-2026-43482 has been patched. Fixed versions include 6.12.78, 6.18.20, 6.19.9 and others. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-43482 actively exploited?
No — CVE-2026-43482 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.