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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().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 27, 2025 |
| Suse | — | Upgrade kernel-kvmsmall-vdsoUpgrade kernel-source-vanillaUpgrade kernel-default-baseUpgrade kernel-obs-buildUpgrade kernel-defaultUpgrade kernel-syms-azureUpgrade kernel-default-vdsoUpgrade kernel-docsUpgrade kernel-64kb-extraUpgrade kernel-azureUpgrade kernel-azure-vdsoUpgrade kernel-azure-develUpgrade kernel-source-azureUpgrade reiserfs-kmp-defaultUpgrade kernel-zfcpdumpUpgrade kernel-sourceUpgrade kernel-azure-extraUpgrade kernel-default-extraUpgrade kernel-default-develUpgrade kernel-docs-htmlUpgrade kernel-kvmsmall-develUpgrade kernel-default-livepatchUpgrade kernel-kvmsmallUpgrade kernel-develUpgrade kernel-macrosUpgrade kernel-symsUpgrade kernel-obs-qaUpgrade kernel-64kb-develUpgrade kernel-devel-azureUpgrade kernel-64kb | Dec 5, 2025 | Jul 8, 2025 |
| Ubuntu | — | Upgrade linux-image-6.11.0-1022-oemUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-azure-fdeUpgrade linux-image-raspiUpgrade linux-image-azureUpgrade linux-image-generic-64kUpgrade linux-image-realtimeUpgrade linux-image-6.11.0-26-genericUpgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-1014-lowlatency-64kUpgrade linux-image-oracle-64kUpgrade linux-image-6.11.0-1015-azureUpgrade linux-image-6.11.0-1015-gcpUpgrade linux-image-6.11.0-1014-lowlatencyUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.11.0-1016-oracle-64kUpgrade linux-image-6.11.0-26-generic-64kUpgrade linux-image-6.11.0-1016-oracleUpgrade linux-image-lowlatency-64kUpgrade linux-image-genericUpgrade linux-image-6.11.0-1014-awsUpgrade linux-image-6.11.0-1015-azure-fdeUpgrade linux-image-6.11.0-1010-realtimeUpgrade linux-image-gcpUpgrade linux-image-oracleUpgrade linux-image-oem-24.04bUpgrade linux-image-6.11.0-1015-gcp-64kUpgrade linux-image-6.11.0-1013-raspiUpgrade linux-image-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-aws | May 21, 2025 | Feb 27, 2025 |
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