177 lines
9.3 KiB
JSON
177 lines
9.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-53283",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-06-09T07:44:35.396Z",
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"datePublished": "2026-06-26T19:40:44.573Z",
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"dateUpdated": "2026-11-06T16:34:17.582Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-06-26T19:40:44.573Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/iommu/amd/iommu.c"
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],
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"versions": [
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{
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"version": "e874c666b15bcb6280c4e747d8de3879bb728829",
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"lessThan": "f0a0f01787ecece814414b0665df879b69849d09",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e874c666b15bcb6280c4e747d8de3879bb728829",
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"lessThan": "79db4cbab81f07ce69a93d379ebd40d3709ecfb2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e874c666b15bcb6280c4e747d8de3879bb728829",
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"lessThan": "07d0f496fe7ec5abe3bee7e38be709521567bb33",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/iommu/amd/iommu.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.33",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.10",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.33"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.0.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f0a0f01787ecece814414b0665df879b69849d09"
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},
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{
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"url": "https://git.kernel.org/stable/c/79db4cbab81f07ce69a93d379ebd40d3709ecfb2"
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},
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{
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"url": "https://git.kernel.org/stable/c/07d0f496fe7ec5abe3bee7e38be709521567bb33"
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}
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],
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"title": "iommu/amd: Bounds-check devid in __rlookup_amd_iommu()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-53283",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-11-06T16:25:02.512373Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-11-06T16:34:17.582Z"
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}
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}
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]
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}
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} |