CVE-2026-52952

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This is necessary to\nfence concurrent attachments to a multi-device group where devices might\nshare the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in\n__iommu_group_set_domain_nofail().\n\nOther IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such\nas __iommu_group_set_core_domain and __iommu_release_dma_ownership, should\nnot be rejected, as the domain would be freed anyway in these nofail paths\nwhile group->domain is still pointing to it. So pci_dev_reset_iommu_done()\ncould trigger a UAF when re-attaching group->domain.\n\nHonor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through\nthe group->recovery_cnt fence, so as to update the group->domain pointer.\nInstead add a gdev->blocked check in the device iteration loop, to prevent\nany concurrent per-device detachment."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable IOMMU recovery path is reached through local PCI/VFIO/IOMMUFD operations such as device reset and domain attach/detach, not by remote packets or physical insertion.\nAC:L - A caller with access to the VFIO/IOMMUFD device can create the reset window and concurrently detach/release the domain; the race window is attacker-influenced and does not depend on rare external conditions.\nPR:L - Exploitation requires local access to an assigned VFIO/IOMMUFD-capable device or equivalent device node permissions, but not necessarily full init-namespace root once the device is delegated.\nUI:N - No victim action is needed after the attacker has the local device access; the attacker can issue the reset and detach operations directly.\nS:C - The stale freed IOMMU domain can affect DMA/IOMMU isolation, allowing impact beyond the attacker's assigned device/IOMMU context and into host-protected resources.\nC:H - The bug can leave `group->domain` pointing to a freed IOMMU domain and then reattach through it, a use-after-free that can plausibly be shaped into disclosure of protected host memory.\nI:H - Reusing a freed IOMMU domain during device reattachment can corrupt IOMMU state or subvert DMA mappings, giving a plausible path to arbitrary modification of protected memory.\nA:H - At minimum the stale domain dereference and WARN/UAF path can crash or destabilize the kernel during reset recovery."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/iommu.c"], "versions": [{"version": "c279e83953d937470f8a6e69b69f62608714f13f", "lessThan": "8fc289e809f3eb7e36cadc4684ab6fad747a5a93", "status": "affected", "versionType": "git"}, {"version": "c279e83953d937470f8a6e69b69f62608714f13f", "lessThan": "5474e6e17a262db45c60575c73f70210f5c7001f", "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/iommu.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "7.0", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93"}, {"url": "https://git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001f"}], "title": "iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10"], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:6"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:8"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:8"], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:9"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:9"], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat"}], "datePublic": "2026-06-24T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A flaw was found in the Linux kernel's Input/Output Memory Management Unit (IOMMU) subsystem, which manages how devices access system memory. 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This is necessary to\nfence concurrent attachments to a multi-device group where devices might\nshare the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in\n__iommu_group_set_domain_nofail().\n\nOther IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such\nas __iommu_group_set_core_domain and __iommu_release_dma_ownership, should\nnot be rejected, as the domain would be freed anyway in these nofail paths\nwhile group->domain is still pointing to it. So pci_dev_reset_iommu_done()\ncould trigger a UAF when re-attaching group->domain.\n\nHonor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through\nthe group->recovery_cnt fence, so as to update the group->domain pointer.\nInstead add a gdev->blocked check in the device iteration loop, to prevent\nany concurrent per-device detachment."}], "id": "CVE-2026-52952", "lastModified": "2026-07-15T01:16:24.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}, "published": "2026-06-24T17:17:05.333", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-52952"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492422"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52952.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-825"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset", "id": "2492422", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492422"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset\nIn __iommu_group_set_domain_internal(), concurrent domain attachments are\nrejected when any device in the group is recovering. This is necessary to\nfence concurrent attachments to a multi-device group where devices might\nshare the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in\n__iommu_group_set_domain_nofail().\nOther IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such\nas __iommu_group_set_core_domain and __iommu_release_dma_ownership, should\nnot be rejected, as the domain would be freed anyway in these nofail paths\nwhile group->domain is still pointing to it. So pci_dev_reset_iommu_done()\ncould trigger a UAF when re-attaching group->domain.\nHonor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through\nthe group->recovery_cnt fence, so as to update the group->domain pointer.\nInstead add a gdev->blocked check in the device iteration loop, to prevent\nany concurrent per-device detachment.", "A flaw was found in the Linux kernel's Input/Output Memory Management Unit (IOMMU) subsystem, which manages how devices access system memory. A race condition, a situation where multiple operations occur in an unpredictable order, exists during device recovery when multiple memory domains are being attached concurrently. This can lead to a Use-After-Free (UAF) vulnerability, where the system attempts to use memory that has already been released, potentially allowing a local attacker to execute unauthorized code or cause the system to crash (denial of service)."], "name": "CVE-2026-52952", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52952\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52952\nhttps://lore.kernel.org/linux-cve-announce/2026062434-CVE-2026-52952-0cff@gregkh/T"], "threat_severity": "Important"}

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