GHSA-R24P-J496-7RXG
Vulnerability from github – Published: 2025-02-27 03:34 – Updated: 2025-03-07 12:31In 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().
{
"affected": [],
"aliases": [
"CVE-2025-21713"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-27T02:15:14Z",
"severity": "MODERATE"
},
"details": "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().",
"id": "GHSA-r24p-j496-7rxg",
"modified": "2025-03-07T12:31:58Z",
"published": "2025-02-27T03:34:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21713"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/17391cb2613b82f8c405570fea605af3255ff8d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ac12372a13dab3f7a2762db240bd180de8ef1e5e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b853ff0b514c1df314246fcf94744005914b48cb"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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