CVE-2025-21713 (GCVE-0-2025-21713)
Vulnerability from cvelistv5
Published
2025-02-27 02:07
Modified
2026-05-11 21:04
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: f431a8cde7f102fce412546db6e62fdbde1131a7
Version: f431a8cde7f102fce412546db6e62fdbde1131a7
Version: f431a8cde7f102fce412546db6e62fdbde1131a7
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries/iommu: Don\u0027t unset window if it was never set\n\nOn pSeries, when user attempts to use the same vfio container used by\ndifferent iommu group, the spapr_tce_set_window() returns -EPERM\nand the subsequent cleanup leads to the below crash.\n\n   Kernel attempted to read user page (308) - exploit attempt?\n   BUG: Kernel NULL pointer dereference on read at 0x00000308\n   Faulting instruction address: 0xc0000000001ce358\n   Oops: Kernel access of bad area, sig: 11 [#1]\n   NIP:  c0000000001ce358 LR: c0000000001ce05c CTR: c00000000005add0\n   \u003csnip\u003e\n   NIP [c0000000001ce358] spapr_tce_unset_window+0x3b8/0x510\n   LR [c0000000001ce05c] spapr_tce_unset_window+0xbc/0x510\n   Call Trace:\n     spapr_tce_unset_window+0xbc/0x510 (unreliable)\n     tce_iommu_attach_group+0x24c/0x340 [vfio_iommu_spapr_tce]\n     vfio_container_attach_group+0xec/0x240 [vfio]\n     vfio_group_fops_unl_ioctl+0x548/0xb00 [vfio]\n     sys_ioctl+0x754/0x1580\n     system_call_exception+0x13c/0x330\n     system_call_vectored_common+0x15c/0x2ec\n   \u003csnip\u003e\n   --- interrupt: 3000\n\nFix this by having null check for the tbl passed to the\nspapr_tce_unset_window()."
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