{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74355", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.887Z", "datePublished": "2026-08-15T05:58:40.766Z", "dateUpdated": "2026-08-17T05:46:16.092Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:16.092Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix RB-tree corruption in probe error path\n\nThe info->node RB-tree member is zero-initialized via kzalloc. If\na device does not support ATS, the device_rbtree_insert() call is\nskipped. If a subsequent probe step fails, the error path jumps to\ndevice_rbtree_remove(), which misinterprets the zeroed node as\na tree root and corrupts the device RB-tree.\n\nFix this by explicitly initializing the RB-node as empty using\nRB_CLEAR_NODE() during initialization and guarding the removal with\nRB_EMPTY_NODE()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is hit in intel_iommu_probe_device() during IOMMU device probing on the PCI bus notifier path (BUS_NOTIFY_ADD_DEVICE), which is only reachable via local kernel actions such as PCI hotplug/rescan, SR-IOV VF creation, or driver bind\u2014not via any network protocol.\nAC:L - A privileged attacker can reliably trigger the fault path by inducing PASID table allocation failure (e.g., memory pressure) while adding or reprobing a non-ATS PCI function on a VT-d scalable-mode host where ATS-capable devices may already populate the IOMMU device RB-tree.\nPR:H - Reaching intel_iommu_probe_device() requires adding or reprobing PCI/IOMMU devices through kernel-local administration (CAP_SYS_ADMIN for sysfs rescan/SR-IOV, or equivalent host control); this cannot be done from an unprivileged user or user namespace alone.\nUI:N - Exploitation does not depend on any victim user action beyond the attacker (or administrator) initiating device probe/hotplug; no interactive user steps are required once the privileged trigger is performed.\nS:C - Corrupting the Intel VT-d device RB-tree breaks RID-to-device tracking used for IOMMU page-request and invalidation handling, which can undermine DMA/IOMMU isolation boundaries (e.g., SR-IOV/assigned-device or host DMA containment), not just the probing process itself.\nC:H - Calling rb_erase() on a zero-initialized RB-node can null the tree root and corrupt kernel RB-tree pointers; such kernel memory corruption is exploitable to obtain arbitrary read primitives or leak sensitive kernel data during subsequent lookups.\nI:H - The erroneous rb_erase() performs out-of-tree pointer writes that corrupt IOMMU device tracking structures, providing a kernel memory corruption primitive that can be developed into arbitrary write or code execution.\nA:H - RB-tree corruption in the IOMMU device map can cause kernel oopses/panics during later device_rbtree_find() operations in interrupt-driven VT-d page-request or invalidation-timeout paths, resulting in complete loss of kernel availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/intel/iommu.c"], "versions": [{"version": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4", "lessThan": "f5102e0fc3c6dc8685549891a96e4589fdb3e211", "status": "affected", "versionType": "git"}, {"version": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4", "lessThan": "d16923a45d4d08367650fdc3451c89299ab6ac5a", "status": "affected", "versionType": "git"}, {"version": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4", "lessThan": "43bd9e6d5513cb1edbafdeef146a1edc3aaced56", "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/intel/iommu.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.15", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f5102e0fc3c6dc8685549891a96e4589fdb3e211"}, {"url": "https://git.kernel.org/stable/c/d16923a45d4d08367650fdc3451c89299ab6ac5a"}, {"url": "https://git.kernel.org/stable/c/43bd9e6d5513cb1edbafdeef146a1edc3aaced56"}], "title": "iommu/vt-d: Fix RB-tree corruption in probe error path", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iommu/intel/iommu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f5102e0fc3c6dc8685549891a96e4589fdb3e211", "status": "affected", "version": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4", "versionType": "git"}, {"lessThan": "d16923a45d4d08367650fdc3451c89299ab6ac5a", "status": "affected", "version": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4", "versionType": "git"}, {"lessThan": "43bd9e6d5513cb1edbafdeef146a1edc3aaced56", "status": "affected", "version": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iommu/intel/iommu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix RB-tree corruption in probe error path\n\nThe info->node RB-tree member is zero-initialized via kzalloc. If\na device does not support ATS, the device_rbtree_insert() call is\nskipped. If a subsequent probe step fails, the error path jumps to\ndevice_rbtree_remove(), which misinterprets the zeroed node as\na tree root and corrupts the device RB-tree.\n\nFix this by explicitly initializing the RB-node as empty using\nRB_CLEAR_NODE() during initialization and guarding the removal with\nRB_EMPTY_NODE()."}], "id": "CVE-2026-74355", "lastModified": "2026-08-17T06:19:30.180", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.5, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:36.887", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/43bd9e6d5513cb1edbafdeef146a1edc3aaced56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d16923a45d4d08367650fdc3451c89299ab6ac5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f5102e0fc3c6dc8685549891a96e4589fdb3e211"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: iommu/vt-d: Fix RB-tree corruption in probe error path", "id": "2516855", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516855"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niommu/vt-d: Fix RB-tree corruption in probe error path\nThe info->node RB-tree member is zero-initialized via kzalloc. If\na device does not support ATS, the device_rbtree_insert() call is\nskipped. If a subsequent probe step fails, the error path jumps to\ndevice_rbtree_remove(), which misinterprets the zeroed node as\na tree root and corrupts the device RB-tree.\nFix this by explicitly initializing the RB-node as empty using\nRB_CLEAR_NODE() during initialization and guarding the removal with\nRB_EMPTY_NODE().", "A flaw was found in the Linux kernel's iommu/vt-d component. This vulnerability occurs when the info->node RB-tree member is zero-initialized, and a device that does not support Address Translation Services (ATS) skips the device_rbtree_insert() call. If a subsequent probe step fails, the error path incorrectly attempts to remove a zeroed node, misinterpreting it as a tree root. This misinterpretation leads to corruption of the device RB-tree, which can result in system instability or a denial of service."], "name": "CVE-2026-74355", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74355\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74355\nhttps://lore.kernel.org/linux-cve-announce/2026081500-CVE-2026-74355-99a3@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f1492efb495bcef34c9ee8a94af81e6cea5abf4,f5102e0fc3c6dc8685549891a96e4589fdb3e211)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f1492efb495bcef34c9ee8a94af81e6cea5abf4,d16923a45d4d08367650fdc3451c89299ab6ac5a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4f1492efb495bcef34c9ee8a94af81e6cea5abf4,43bd9e6d5513cb1edbafdeef146a1edc3aaced56)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T13:00:05.627555+00:00", "updated": "2026-08-22T00:00:16.119771+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-665", "CWE-824"]}