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CVE-2025-37880 – Linux um Time-Travel Scheduling Vulnerability (Deadlock)

The following table lists the changes that have been made to the
CVE-2025-37880 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 09, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    um: work around sched_yield not yielding in time-travel mode

    sched_yield by a userspace may not actually cause scheduling in
    time-travel mode as no time has passed. In the case seen it appears to
    be a badly implemented userspace spinlock in ASAN. Unfortunately, with
    time-travel it causes an extreme slowdown or even deadlock depending on
    the kernel configuration (CONFIG_UML_MAX_USERSPACE_ITERATIONS).

    Work around it by accounting time to the process whenever it executes a
    sched_yield syscall.
    Added Reference https://git.kernel.org/stable/c/887c5c12e80c8424bd471122d2e8b6b462e12874
    Added Reference https://git.kernel.org/stable/c/990ddc65173776f1e01e7135d8c1fd5f8fd4d5d2
    Added Reference https://git.kernel.org/stable/c/da780c4a075ba2deb05ae29f0af4a990578c7901
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