{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64285", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.777Z", "datePublished": "2026-07-25T08:49:26.898Z", "dateUpdated": "2026-08-17T04:52:40.907Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:52:40.907Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Pin source page for write when adding CPUID data for SNP guest\n\nWhen populating a guest_memfd instance with the initial CPUID data for an\nSNP guest, acquire a writable pin on the source page as KVM will write back\nthe \"correct\" CPUID information if the userspace provided data is rejected\nby trusted firmware. Because KVM writes to the source page using a kernel\nmapping, pinning for read could result in KVM clobbering read-only memory.\n\nNote, well-behaved VMMs are unlikely to be affected, as CPUID information\nis almost always dynamically generated by userspace, i.e. it's unlikely for\nthe CPUID information to be backed by a read-only mapping.\n\n[sean: rewrite shortlog and changelog, tag for stable@]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/svm/sev.c", "arch/x86/kvm/vmx/tdx.c", "include/linux/kvm_host.h", "virt/kvm/guest_memfd.c"], "versions": [{"version": "2a62345b30529e488beb6a1220577b3495933724", "lessThan": "dcdb476f5fc5701ec06c23efe3e3529f07ca391e", "status": "affected", "versionType": "git"}, {"version": "2a62345b30529e488beb6a1220577b3495933724", "lessThan": "f13e900599089b10113ceb36013423f0837c6792", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/svm/sev.c", "arch/x86/kvm/vmx/tdx.c", "include/linux/kvm_host.h", "virt/kvm/guest_memfd.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "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": "7.0", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dcdb476f5fc5701ec06c23efe3e3529f07ca391e"}, {"url": "https://git.kernel.org/stable/c/f13e900599089b10113ceb36013423f0837c6792"}], "title": "KVM: SEV: Pin source page for write when adding CPUID data for SNP guest", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/kvm/svm/sev.c", "arch/x86/kvm/vmx/tdx.c", "include/linux/kvm_host.h", "virt/kvm/guest_memfd.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "dcdb476f5fc5701ec06c23efe3e3529f07ca391e", "status": "affected", "version": "2a62345b30529e488beb6a1220577b3495933724", "versionType": "git"}, {"lessThan": "f13e900599089b10113ceb36013423f0837c6792", "status": "affected", "version": "2a62345b30529e488beb6a1220577b3495933724", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/kvm/svm/sev.c", "arch/x86/kvm/vmx/tdx.c", "include/linux/kvm_host.h", "virt/kvm/guest_memfd.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6671DC8A-F2BA-41D7-952A-1FDF61F2FDC1", "versionEndExcluding": "7.1.4", "versionStartIncluding": "7.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Pin source page for write when adding CPUID data for SNP guest\n\nWhen populating a guest_memfd instance with the initial CPUID data for an\nSNP guest, acquire a writable pin on the source page as KVM will write back\nthe \"correct\" CPUID information if the userspace provided data is rejected\nby trusted firmware. Because KVM writes to the source page using a kernel\nmapping, pinning for read could result in KVM clobbering read-only memory.\n\nNote, well-behaved VMMs are unlikely to be affected, as CPUID information\nis almost always dynamically generated by userspace, i.e. it's unlikely for\nthe CPUID information to be backed by a read-only mapping.\n\n[sean: rewrite shortlog and changelog, tag for stable@]"}], "id": "CVE-2026-64285", "lastModified": "2026-08-17T05:17:27.917", "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"}]}, "published": "2026-07-25T10:17:09.140", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dcdb476f5fc5701ec06c23efe3e3529f07ca391e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f13e900599089b10113ceb36013423f0837c6792"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: SEV: Pin source page for write when adding CPUID data for SNP guest", "id": "2507257", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507257"}, "csaw": false, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) component, specifically within the Secure Nested Paging (SNP) guest functionality. When KVM populates a guest's CPUID (Central Processor Unit Identifier) data, it may attempt to write to a source memory page that is intended to be read-only. This incorrect memory pinning could lead to memory corruption, potentially allowing an attacker to overwrite sensitive data within the kernel."], "name": "CVE-2026-64285", "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"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64285\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64285\nhttps://lore.kernel.org/linux-cve-announce/2026072503-CVE-2026-64285-0481@gregkh/T"]}