{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53283",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.396Z",
        "datePublished": "2026-06-26T19:40:44.573Z",
        "dateUpdated": "2026-06-26T19:40:44.573Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-26T19:40:44.573Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Bounds-check devid in __rlookup_amd_iommu()\n\niommu_device_register() walks every device on the PCI bus via\nbus_for_each_dev() and calls amd_iommu_probe_device() for each. The\ninlined check_device() path computes the device's sbdf, calls\nrlookup_amd_iommu() to find the owning IOMMU, and only afterwards\nverifies devid <= pci_seg->last_bdf. __rlookup_amd_iommu() indexes\nrlookup_table[devid] with no bounds check of its own, so for a PCI\ndevice whose BDF is not described by the IVRS, the lookup reads past\nthe end of the allocation before the caller's bounds check can run.\n\nThis was harmless before commit e874c666b15b (\"iommu/amd: Change\nrlookup, irq_lookup, and alias to use kvalloc()\"): the table was a\nzeroed page-order allocation, so the over-read returned NULL and the\ncaller's NULL check skipped the device. After that commit the table is\na tight kvcalloc() and the over-read returns adjacent slab contents,\nwhich check_device() then dereferences as a struct amd_iommu *,\ncausing a boot-time GPF.\n\nSeen on Google Compute Engine ct6e VMs, where the virtualized IVRS\ndescribes only the four TPU endpoints 00:04.0-07.0; the gVNIC at\n00:08.0 (devid 0x40) indexes 56 bytes past the 456-byte allocation,\ninto the adjacent kmalloc-512 slab object:\n\n  pci 0000:00:04.0: Adding to iommu group 0\n  pci 0000:00:05.0: Adding to iommu group 1\n  pci 0000:00:06.0: Adding to iommu group 2\n  pci 0000:00:07.0: Adding to iommu group 3\n  Oops: general protection fault, probably for non-canonical address 0x3a64695f78746382: 0000 [#1] SMP NOPTI\n  CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.22 #1\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/06/2025\n  RIP: 0010:amd_iommu_probe_device+0x54/0x3a0\n  Call Trace:\n   __iommu_probe_device+0x107/0x520\n   probe_iommu_group+0x29/0x50\n   bus_for_each_dev+0x7e/0xe0\n   iommu_device_register+0xc9/0x240\n   iommu_go_to_state+0x9c0/0x1c60\n   amd_iommu_init+0x14/0x40\n   pci_iommu_init+0x16/0x60\n   do_one_initcall+0x47/0x2f0\n\nGuard the array access in __rlookup_amd_iommu(). With the fix applied\non 6.18.22, the gVNIC at 00:08.0 is skipped cleanly and the VM boots."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iommu/amd/iommu.c"
                    ],
                    "versions": [
                        {
                            "version": "e874c666b15bcb6280c4e747d8de3879bb728829",
                            "lessThan": "f0a0f01787ecece814414b0665df879b69849d09",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e874c666b15bcb6280c4e747d8de3879bb728829",
                            "lessThan": "79db4cbab81f07ce69a93d379ebd40d3709ecfb2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e874c666b15bcb6280c4e747d8de3879bb728829",
                            "lessThan": "07d0f496fe7ec5abe3bee7e38be709521567bb33",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iommu/amd/iommu.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.33",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.18.33"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.0.10"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f0a0f01787ecece814414b0665df879b69849d09"
                },
                {
                    "url": "https://git.kernel.org/stable/c/79db4cbab81f07ce69a93d379ebd40d3709ecfb2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/07d0f496fe7ec5abe3bee7e38be709521567bb33"
                }
            ],
            "title": "iommu/amd: Bounds-check devid in __rlookup_amd_iommu()",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}