138 lines
7.6 KiB
JSON
138 lines
7.6 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-2026-64152",
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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": "2026-07-19T07:54:57.037Z",
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"datePublished": "2026-07-19T15:40:41.354Z",
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"dateUpdated": "2026-08-05T12:39:46.961Z"
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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": "2026-08-05T12:39:46.961Z"
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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: Handle unmap error when iommu_debug is enabled\n\nSashiko noticed a latent bug where the map error flow called iommu_unmap()\nwhich calls iommu_debug_unmap_begin()/iommu_debug_unmap_end() however\nsince this is an error path the map flow never actually established the\noriginal iommu_debug_map() it will malfunction.\n\nLift the unmap error handling into iommu_map_nosync() and reorder it so\nthe trace_map()/iommu_debug_map() records the partial mapping and then\nimmediately unmaps it. This avoid creating the unbalanced tracking and\nprovides saner tracing instead of a unmap unmatched to any map."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached only through local kernel IOMMU APIs invoked from userspace ioctl paths such as IOMMUFD IOAS mapping (/dev/iommu) and VFIO DMA mapping (/dev/vfio/vfio), not from any network packet handler.\nAC:H - Exploitation requires CONFIG_IOMMU_DEBUG_PAGEALLOC plus the iommu.debug_pagealloc=1 boot parameter (both admin-controlled debug options absent from production kernels) and a partial IOMMU map failure, conditions the attacker cannot establish unilaterally.\nPR:L - Triggering iommu_map() requires only local userspace access to IOMMUFD or VFIO interfaces (e.g., /dev/vfio/vfio at mode 0666), which an unprivileged local user or cloud VM tenant with assigned passthrough devices can obtain without host root.\nUI:N - No victim interaction is required; the attacker triggers the bug directly through IOMMU map ioctl operations that fail partway through.\nS:C - The bug corrupts IOMMU page-tracking metadata used to enforce the DMA/IOMMU security boundary, and a VM tenant with VFIO passthrough can trigger it in the host kernel, crossing the guest-to-host security authority.\nC:H - Unbalanced debug refcount decrements corrupt page_ext IOMMU tracking state, which can suppress detection of pages still mapped for DMA and thereby permit device reads of host physical memory that should be isolated.\nI:H - Corrupted IOMMU debug tracking is memory corruption in kernel metadata that can mask stale DMA mappings, enabling a device to write host memory across the IOMMU boundary; WARN_ON underflow paths also demonstrate uncontrolled kernel state corruption.\nA:H - The bug triggers WARN_ON on atomic refcount underflow during unmap_begin/dec_page, which can cause kernel oops or panic (especially with panic_on_warn), constituting high availability impact."
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}
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]
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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/iommu.c"
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],
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"versions": [
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{
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"version": "ccc21213f013834b484cdcc738e282f963fcfc97",
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"lessThan": "0cd028806efc148a75d4acf711d21db335a89661",
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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": "ccc21213f013834b484cdcc738e282f963fcfc97",
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"lessThan": "0735c54804c709d1b292f3b6947cfb560b2ce552",
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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/iommu.c"
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],
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"versions": [
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{
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"version": "7.0",
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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": "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": "7.0.11",
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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": "7.0",
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"versionEndExcluding": "7.0.11"
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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": "7.0",
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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/0cd028806efc148a75d4acf711d21db335a89661"
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},
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{
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"url": "https://git.kernel.org/stable/c/0735c54804c709d1b292f3b6947cfb560b2ce552"
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}
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],
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"title": "iommu: Handle unmap error when iommu_debug is enabled",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |