CVE-2026-63939

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But for PSC requests, the incoming @len\nis just the minimum length (to process the header), and KVM needs to know\nthe full size of the scratch area to avoid buffer overflows (spoiler alert).\n\nOpportunistically rename @len => @min_len to better reflect its role."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.3, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires code running inside an SEV-SNP KVM guest that issues a PSC VMGEXIT via the GHCB protocol; the vulnerable path is reached through the local VM/hypercall interface (SVM_EXIT_VMGEXIT), not via any network-facing protocol.\nAC:L - Once running in an SEV-SNP guest, the attacker fully controls the GHCB scratch GPA, PSC header indices, and entry contents, and can reliably trigger the bug without races or conditions outside their control.\nPR:N - No host privileges are required; a cloud tenant or any party able to run a malicious SEV-SNP guest VM can reach this code without host root or CAP_SYS_ADMIN in the host init namespace.\nUI:N - Exploitation requires no action from a victim user; the malicious guest triggers the vulnerability autonomously during PSC VMGEXIT processing.\nS:C - The flaw is in KVM host-side handling of guest VMGEXIT requests and enables out-of-bounds kernel access that crosses the guest-to-hypervisor security boundary, consistent with a VM escape primitive.\nC:H - The bug causes out-of-bounds reads of PSC entry structures beyond the computed scratch buffer length, which can leak kernel-mapped memory adjacent to the GHCB page.\nI:H - The kernel writes PSC completion data (entry cur_page and hdr.cur_entry) using attacker-controlled indices beyond the actual scratch buffer, enabling out-of-bounds writes exploitable for memory corruption.\nA:H - Out-of-bounds access within the host's GHCB mapping can corrupt adjacent memory and trigger kernel oopses or panics, and repeated exploitation can deny service to the host and other tenants."}]}], "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"], "versions": [{"version": "9b54e248d2644be71cb394eb85f31ad99e023a05", "lessThan": "6ca9400d36005ffdca25f80186bea781c7e1dc4c", "status": "affected", "versionType": "git"}, {"version": "9b54e248d2644be71cb394eb85f31ad99e023a05", "lessThan": "9f0a9e780f02c02d025a190f1885e1d1d73b87bd", "status": "affected", "versionType": "git"}, {"version": "9b54e248d2644be71cb394eb85f31ad99e023a05", "lessThan": "6644565527c4c5f507088b1c9ddf72de47790b68", "status": "affected", "versionType": "git"}, {"version": "9b54e248d2644be71cb394eb85f31ad99e023a05", "lessThan": "5867d7e202e09f037cefe77f7af4413c7c0fa088", "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"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "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": "6.11", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6ca9400d36005ffdca25f80186bea781c7e1dc4c"}, {"url": "https://git.kernel.org/stable/c/9f0a9e780f02c02d025a190f1885e1d1d73b87bd"}, {"url": "https://git.kernel.org/stable/c/6644565527c4c5f507088b1c9ddf72de47790b68"}, {"url": "https://git.kernel.org/stable/c/5867d7e202e09f037cefe77f7af4413c7c0fa088"}], "title": "KVM: SEV: Compute the correct max length of the in-GHCB scratch area", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63939", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:33:48.298824Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:17:57.791Z"}}]}}

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But for PSC requests, the incoming @len\nis just the minimum length (to process the header), and KVM needs to know\nthe full size of the scratch area to avoid buffer overflows (spoiler alert).\n\nOpportunistically rename @len => @min_len to better reflect its role."}], "id": "CVE-2026-63939", "lastModified": "2026-10-28T18:33:16.910", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63939", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:33:48.298824Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:12.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5867d7e202e09f037cefe77f7af4413c7c0fa088"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6644565527c4c5f507088b1c9ddf72de47790b68"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ca9400d36005ffdca25f80186bea781c7e1dc4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f0a9e780f02c02d025a190f1885e1d1d73b87bd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: KVM: SEV: Compute the correct max length of the in-GHCB scratch area", "id": "2502365", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502365"}, "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-131", "details": ["A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) with Secure Encrypted Virtualization (SEV) support. This vulnerability arises from an incorrect calculation of the maximum length for the in-Guest-Host Communication Block (GHCB) scratch area. When processing Page State Change (PSC) requests, KVM uses a minimum length instead of the full required size, which can lead to a buffer overflow. A malicious guest operating system could potentially exploit this to cause a denial of service or escalate privileges on the host system."], "name": "CVE-2026-63939", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63939\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63939\nhttps://lore.kernel.org/linux-cve-announce/2026071952-CVE-2026-63939-8061@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b54e248d2644be71cb394eb85f31ad99e023a05,6ca9400d36005ffdca25f80186bea781c7e1dc4c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b54e248d2644be71cb394eb85f31ad99e023a05,9f0a9e780f02c02d025a190f1885e1d1d73b87bd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b54e248d2644be71cb394eb85f31ad99e023a05,6644565527c4c5f507088b1c9ddf72de47790b68)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9b54e248d2644be71cb394eb85f31ad99e023a05,5867d7e202e09f037cefe77f7af4413c7c0fa088)"}}], "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": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.93,6.13.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.35,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.12,7.1.0]"}}, {"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": "2026-07-21T05:30:16.524282+00:00", "updated": "2026-10-20T03:30:08.102708+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-122", "CWE-131"]}