{"cve":{"cve_id":"CVE-2026-53283","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"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.","published_at":"2026-06-26T19:40:44.573000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/f0a0f01787ecece814414b0665df879b69849d09","https://git.kernel.org/stable/c/79db4cbab81f07ce69a93d379ebd40d3709ecfb2","https://git.kernel.org/stable/c/07d0f496fe7ec5abe3bee7e38be709521567bb33"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:28.590503Z","updated_at":"2026-06-28T23:30:51.545322Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"e874c666b15bcb6280c4e747d8de3879bb728829","version_start_inclusive":true,"version_end":"f0a0f01787ecece814414b0665df879b69849d09","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:e874c666b15bcb6280c4e747d8de3879bb728829:f0a0f01787ecece814414b0665df879b69849d09"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"e874c666b15bcb6280c4e747d8de3879bb728829","version_start_inclusive":true,"version_end":"79db4cbab81f07ce69a93d379ebd40d3709ecfb2","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:e874c666b15bcb6280c4e747d8de3879bb728829:79db4cbab81f07ce69a93d379ebd40d3709ecfb2"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"e874c666b15bcb6280c4e747d8de3879bb728829","version_start_inclusive":true,"version_end":"07d0f496fe7ec5abe3bee7e38be709521567bb33","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:e874c666b15bcb6280c4e747d8de3879bb728829:07d0f496fe7ec5abe3bee7e38be709521567bb33"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.16","version_start_inclusive":true,"version_end":"6.16","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.16:6.16"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.16","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.16"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.33","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.33:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.10","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.10:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/f0a0f01787ecece814414b0665df879b69849d09","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/79db4cbab81f07ce69a93d379ebd40d3709ecfb2","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/07d0f496fe7ec5abe3bee7e38be709521567bb33","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-26T19:40:44.573000Z","label":"CVE published","source":null}]}