{ "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—not 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" } } } }