CVE-2025-21713

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

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 <snip> 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 <snip> --- interrupt: 3000 Fix this by having null check for the tbl passed to the spapr_tce_unset_window().

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/b853ff0b514c1df314246fcf94744005914b48cb patch
https://git.kernel.org/stable/c/ac12372a13dab3f7a2762db240bd180de8ef1e5e patch
https://git.kernel.org/stable/c/17391cb2613b82f8c405570fea605af3255ff8d2 patch

Frequently Asked Questions

What is the severity of CVE-2025-21713?
CVE-2025-21713 has been scored as a medium severity vulnerability.
How to fix CVE-2025-21713?
To fix CVE-2025-21713, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21713 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-21713 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21713?
CVE-2025-21713 affects Linux Linux, Linux Linux.
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