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CVE-2025-37996 – KVM arm64 Uninitialized Pointer Vulnerability

The following table lists the changes that have been made to the
CVE-2025-37996 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. 29, 2025

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

    KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()

    Commit fce886a60207 (“KVM: arm64: Plumb the pKVM MMU in KVM”) made the
    initialization of the local memcache variable in user_mem_abort()
    conditional, leaving a codepath where it is used uninitialized via
    kvm_pgtable_stage2_map().

    This can fail on any path that requires a stage-2 allocation
    without transition via a permission fault or dirty logging.

    Fix this by making sure that memcache is always valid.
    Added Reference https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c
    Added Reference https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18
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