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CVE-2025-21713 – IBM Power Virtual IOMMU Unset Window Null Pointer Dereference

The following table lists the changes that have been made to the
CVE-2025-21713 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

    Feb. 27, 2025

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

    powerpc/pseries/iommu: Don’t unset window if it was never set

    On pSeries, when user attempts to use the same vfio container used by
    different iommu group, the spapr_tce_set_window() returns -EPERM
    and the subsequent cleanup leads to the below crash.

    Kernel attempted to read user page (308) – exploit attempt?
    BUG: Kernel NULL pointer dereference on read at 0x00000308
    Faulting instruction address: 0xc0000000001ce358
    Oops: Kernel access of bad area, sig: 11 [#1]
    NIP: c0000000001ce358 LR: c0000000001ce05c CTR: c00000000005add0

    NIP [c0000000001ce358] spapr_tce_unset_window+0x3b8/0x510
    LR [c0000000001ce05c] spapr_tce_unset_window+0xbc/0x510
    Call Trace:
    spapr_tce_unset_window+0xbc/0x510 (unreliable)
    tce_iommu_attach_group+0x24c/0x340 [vfio_iommu_spapr_tce]
    vfio_container_attach_group+0xec/0x240 [vfio]
    vfio_group_fops_unl_ioctl+0x548/0xb00 [vfio]
    sys_ioctl+0x754/0x1580
    system_call_exception+0x13c/0x330
    system_call_vectored_common+0x15c/0x2ec

    — interrupt: 3000

    Fix this by having null check for the tbl passed to the
    spapr_tce_unset_window().
    Added Reference https://git.kernel.org/stable/c/17391cb2613b82f8c405570fea605af3255ff8d2
    Added Reference https://git.kernel.org/stable/c/ac12372a13dab3f7a2762db240bd180de8ef1e5e
    Added Reference https://git.kernel.org/stable/c/b853ff0b514c1df314246fcf94744005914b48cb
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