CVE-2025-40024 – vhost: Take a reference on the task in struct vhost_task.

CVE ID : CVE-2025-40024

Published : Oct. 24, 2025, 1:15 p.m. | 1 hour, 27 minutes ago

Description : 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.

Severity: 0.0 | NA

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