CVE-2025-40024
In the Linux kernel, the following vulnerability has been resolved: vhost: Take a reference on the task in struct vhost_task. vhost_task_create() creates a task and keeps a reference to its task_struct. That task may exit early via a signal and its task_struct will be released. A pending vhost_task_wake() will then attempt to wake the task and access a task_struct which is no longer there. Acquire a reference on the task_struct while creating the thread and release the reference while the struct vhost_task itself is removed. If the task exits early due to a signal, then the vhost_task_wake() will still access a valid task_struct. The wake is safe and will be skipped in this case.
Affected versions
Linux kernel versions
6.4
and later are affected. Fixed in
6.6.109,
6.12.50,
6.16.10,
6.17
and their respective stable series.
References
The following references provide additional information about CVE-2025-40024 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/7ce635b3d3aba43296b62b5a2d97c008bc51cbd2
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PatchKernel patch commithttps://git.kernel.org/stable/c/82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0
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PatchKernel patch commithttps://git.kernel.org/stable/c/afe16653e05db07d658b55245c7a2e0603f136c0
Frequently asked questions
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What is CVE-2025-40024?
CVE-2025-40024 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.4 onward and has been patched in 6.6.109, 6.12.50, 6.16.10 and others. CVE-2025-40024 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-2025-40024?
Yes — CVE-2025-40024 has been patched. Fixed versions include 6.6.109, 6.12.50, 6.16.10 and others. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40024 actively exploited?
No — CVE-2025-40024 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.