165 lines
8.6 KiB
JSON
165 lines
8.6 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-2026-23429",
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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": "2026-01-13T15:37:46.016Z",
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"datePublished": "2026-04-03T15:15:15.856Z",
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"dateUpdated": "2026-08-05T12:21:42.311Z"
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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": "2026-08-05T12:21:42.311Z"
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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/sva: Fix crash in iommu_sva_unbind_device()\n\ndomain->mm->iommu_mm can be freed by iommu_domain_free():\n iommu_domain_free()\n mmdrop()\n __mmdrop()\n mm_pasid_drop()\nAfter iommu_domain_free() returns, accessing domain->mm->iommu_mm may\ndereference a freed mm structure, leading to a crash.\n\nFix this by moving the code that accesses domain->mm->iommu_mm to before\nthe call to iommu_domain_free()."
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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:L/PR:L/UI:N/S:U/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 `iommu_sva_unbind_device()` path is reached through local character/DRM/UIO accelerator device open and release paths, not by remote packets or adjacent-link traffic.\nAC:L - The attacker can deterministically create the lifetime pattern with normal open/fork/exit/close or file-descriptor transfer so the bound `mm` is finally dropped during unbind; no uncontrollable race is required.\nPR:L - The attacker needs local access to an SVA-capable user-exposed accelerator/UIO/idxd device node. The IOMMU SVA bind/unbind path itself has no CAP_* gate, and these devices are intended to be usable by local user processes.\nUI:N - Exploitation can be driven entirely by the attacker's own process and file descriptors. No separate victim action is required.\nS:U - The bug corrupts kernel memory from within a kernel subsystem and does not directly cross a VM, container, or IOMMU/DMA protection boundary. This is standard local kernel compromise scope.\nC:H - The stale `iommu_mm` object is used after it may be freed, and freed-object reuse can provide attacker-influenced data exposure primitives. Per the required guidance, use-after-free is scored as high confidentiality impact.\nI:H - The old code can perform list operations on freed memory after `iommu_domain_free()`, creating a plausible kernel heap/list corruption and arbitrary-write primitive. Per the required guidance, use-after-free is scored as high integrity impact.\nA:H - The documented failure mode is a kernel crash from dereferencing or manipulating freed `mm`/IOMMU SVA state. A kernel oops or panic is 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-sva.c"
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],
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"versions": [
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{
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"version": "9f0a7ab700f8620e433b05c57fbd26c92ea186d9",
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"lessThan": "58abeb7b9562f25bdfa2f5ae5ce803eb02e74433",
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"status": "affected",
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{
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"version": "6.18.7",
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"lessThan": "6.18.20",
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"status": "affected",
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},
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{
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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-sva.c"
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],
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"versions": [
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{
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"version": "6.19",
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"status": "affected"
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{
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"version": "0",
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"lessThan": "6.19",
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"status": "unaffected",
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},
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{
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"lessThanOrEqual": "6.18.*",
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},
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{
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"version": "6.19.10",
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"lessThanOrEqual": "6.19.*",
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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",
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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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"versionStartIncluding": "6.18.7",
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"versionEndExcluding": "6.18.20"
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},
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{
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"vulnerable": true,
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/58abeb7b9562f25bdfa2f5ae5ce803eb02e74433"
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},
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{
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"url": "https://git.kernel.org/stable/c/f5daaa2c959d9f894fb5b1ab76da8612dd220a0d"
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},
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{
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"url": "https://git.kernel.org/stable/c/06e14c36e20b48171df13d51b89fe67c594ed07a"
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}
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],
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"title": "iommu/sva: Fix crash in iommu_sva_unbind_device()",
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