CVE-2026-53345

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This\nwill allow fixing a memory leak for x86 SEV-ES guests without hitting what\nis effectively a false positive on the WARN.\n\nFor some SEV-ES VM-Exits, KVM keeps a writable mapping of a guest page\nacross an exit to userspace, and typically unmaps the page on the next\nKVM_RUN. But if userspace never calls KVM_RUN after such an exit, then KVM\nneeds to unmap the page when the vCPU is destroyed, which in turn triggers\nthe WARN about not having a running vCPU.\n\nAlternatively, SEV-ES could temporarily load the vCPU to suppress the WARN,\nas is done in nested_vmx_free_vcpu() (but for completely unrelated reasons;\nsuppressing WARN from nested_put_vmcs12_pages() is pure happenstance). But\nloading a vCPU during destruction is gross (ideally nVMX code would be\ncleaned up), risks complicating the SEV-ES code (KVM would need to ensure\nthe temporarily load()+put() only runs when the vCPU isn't already loaded),\nand is ultimately pointless.\n\nThe motivation for the WARN is to guard against KVM dirtying guest memory\nwithout pushing the corresponding GFN to the active vCPU's dirty ring, e.g.\nto ensure userspace doesn't miss a dirty page. But for the VM's refcount\nto reach zero, there can't be _any_ userspace mappings to the dirty ring,\nas mapping the dirty ring requires doing mmap() on the vCPU FD. I.e. if\nuserspace had a valid mapping for the dirty ring, then the vCPU file and\nthus the owning VM would still be alive. And so since userspace can't\npossibly reach the dirty ring, whether or not KVM technically \"misses\" a\npush to the dirty ring is irrelevant."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["virt/kvm/kvm_main.c"], "versions": [{"version": "2efd61a608b0039911924d2e5d7028eb37496e85", "lessThan": "21b880f040bd0e8b50ff30c5a40db7bf3384ff48", "status": "affected", "versionType": "git"}, {"version": "2efd61a608b0039911924d2e5d7028eb37496e85", "lessThan": "033d39e41fc30f484f4e4f37fb4cd76b12cbb18e", "status": "affected", "versionType": "git"}, {"version": "2efd61a608b0039911924d2e5d7028eb37496e85", "lessThan": "66a8e7ddd901023c89a2733494d827eca3f9c1b0", "status": "affected", "versionType": "git"}, {"version": "2efd61a608b0039911924d2e5d7028eb37496e85", "lessThan": "343e95c8ecc40e0738975ef4ee24c0c35e800e6b", "status": "affected", "versionType": "git"}, {"version": "2efd61a608b0039911924d2e5d7028eb37496e85", "lessThan": "99d7d43784ae3235026581e9bf892c036e04c8e6", "status": "affected", "versionType": "git"}, {"version": "2efd61a608b0039911924d2e5d7028eb37496e85", "lessThan": "8618004d3e897c0f1b71d9a9ab860461289bb89a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["virt/kvm/kvm_main.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "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": "5.17", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/21b880f040bd0e8b50ff30c5a40db7bf3384ff48"}, {"url": "https://git.kernel.org/stable/c/033d39e41fc30f484f4e4f37fb4cd76b12cbb18e"}, {"url": "https://git.kernel.org/stable/c/66a8e7ddd901023c89a2733494d827eca3f9c1b0"}, {"url": "https://git.kernel.org/stable/c/343e95c8ecc40e0738975ef4ee24c0c35e800e6b"}, {"url": "https://git.kernel.org/stable/c/99d7d43784ae3235026581e9bf892c036e04c8e6"}, {"url": "https://git.kernel.org/stable/c/8618004d3e897c0f1b71d9a9ab860461289bb89a"}], "title": "KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53345", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:27:24.647581Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:34:21.760Z"}}]}}

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This\nwill allow fixing a memory leak for x86 SEV-ES guests without hitting what\nis effectively a false positive on the WARN.\n\nFor some SEV-ES VM-Exits, KVM keeps a writable mapping of a guest page\nacross an exit to userspace, and typically unmaps the page on the next\nKVM_RUN. But if userspace never calls KVM_RUN after such an exit, then KVM\nneeds to unmap the page when the vCPU is destroyed, which in turn triggers\nthe WARN about not having a running vCPU.\n\nAlternatively, SEV-ES could temporarily load the vCPU to suppress the WARN,\nas is done in nested_vmx_free_vcpu() (but for completely unrelated reasons;\nsuppressing WARN from nested_put_vmcs12_pages() is pure happenstance). But\nloading a vCPU during destruction is gross (ideally nVMX code would be\ncleaned up), risks complicating the SEV-ES code (KVM would need to ensure\nthe temporarily load()+put() only runs when the vCPU isn't already loaded),\nand is ultimately pointless.\n\nThe motivation for the WARN is to guard against KVM dirtying guest memory\nwithout pushing the corresponding GFN to the active vCPU's dirty ring, e.g.\nto ensure userspace doesn't miss a dirty page. But for the VM's refcount\nto reach zero, there can't be _any_ userspace mappings to the dirty ring,\nas mapping the dirty ring requires doing mmap() on the vCPU FD. I.e. if\nuserspace had a valid mapping for the dirty ring, then the vCPU file and\nthus the owning VM would still be alive. And so since userspace can't\npossibly reach the dirty ring, whether or not KVM technically \"misses\" a\npush to the dirty ring is irrelevant."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.94", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:27:01.055Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53345", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:34:21.760Z", "dateReserved": "2026-06-09T07:44:35.399Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-01T13:32:25.098Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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This\nwill allow fixing a memory leak for x86 SEV-ES guests without hitting what\nis effectively a false positive on the WARN.\n\nFor some SEV-ES VM-Exits, KVM keeps a writable mapping of a guest page\nacross an exit to userspace, and typically unmaps the page on the next\nKVM_RUN. But if userspace never calls KVM_RUN after such an exit, then KVM\nneeds to unmap the page when the vCPU is destroyed, which in turn triggers\nthe WARN about not having a running vCPU.\n\nAlternatively, SEV-ES could temporarily load the vCPU to suppress the WARN,\nas is done in nested_vmx_free_vcpu() (but for completely unrelated reasons;\nsuppressing WARN from nested_put_vmcs12_pages() is pure happenstance). But\nloading a vCPU during destruction is gross (ideally nVMX code would be\ncleaned up), risks complicating the SEV-ES code (KVM would need to ensure\nthe temporarily load()+put() only runs when the vCPU isn't already loaded),\nand is ultimately pointless.\n\nThe motivation for the WARN is to guard against KVM dirtying guest memory\nwithout pushing the corresponding GFN to the active vCPU's dirty ring, e.g.\nto ensure userspace doesn't miss a dirty page. But for the VM's refcount\nto reach zero, there can't be _any_ userspace mappings to the dirty ring,\nas mapping the dirty ring requires doing mmap() on the vCPU FD. I.e. if\nuserspace had a valid mapping for the dirty ring, then the vCPU file and\nthus the owning VM would still be alive. And so since userspace can't\npossibly reach the dirty ring, whether or not KVM technically \"misses\" a\npush to the dirty ring is irrelevant."}], "id": "CVE-2026-53345", "lastModified": "2026-11-06T17:18:25.773", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53345", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:27:24.647581Z", "version": "2.0.3"}}]}, "published": "2026-07-01T14:16:42.573", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/033d39e41fc30f484f4e4f37fb4cd76b12cbb18e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/21b880f040bd0e8b50ff30c5a40db7bf3384ff48"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/343e95c8ecc40e0738975ef4ee24c0c35e800e6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66a8e7ddd901023c89a2733494d827eca3f9c1b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8618004d3e897c0f1b71d9a9ab860461289bb89a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99d7d43784ae3235026581e9bf892c036e04c8e6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying", "id": "2495937", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495937"}, "csaw": false, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) component. This vulnerability occurs when a virtual machine is shutting down, and KVM attempts to mark memory as dirty without an active virtual CPU. This can lead to a memory leak, impacting system stability and resource availability. The issue is related to how KVM handles guest memory during the destruction of a virtual CPU."], "name": "CVE-2026-53345", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "2026-07-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53345\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53345\nhttps://lore.kernel.org/linux-cve-announce/2026070145-CVE-2026-53345-77f7@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,033d39e41fc30f484f4e4f37fb4cd76b12cbb18e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,66a8e7ddd901023c89a2733494d827eca3f9c1b0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,343e95c8ecc40e0738975ef4ee24c0c35e800e6b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,99d7d43784ae3235026581e9bf892c036e04c8e6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8618004d3e897c0f1b71d9a9ab860461289bb89a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.6.143)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.94)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.36)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.0.13)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.143,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.94,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-07-01T15:00:06.693322+00:00", "updated": "2026-08-12T10:00:01.831241+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}