{"id":"CVE-2026-63938","revision":"29bb80710958488c8e61ba2fbd199fd3","records":[{"revision":"29bb80710958488c8e61ba2fbd199fd3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63938","aliases":[],"title":"KVM: SEV: Check PSC request indices against the actual size of the buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Check PSC request indices against the actual size of the buffer\n\nWhen processing Page State Change (PSC) requests, validate the PSC buffer\nagainst the effective size of the scratch area, which could be less than\nthe maximum size if the guest provided a pointer that isn't exactly at the\nstart of the GHCB shared buffer.","state":0,"publishedAt":"2026-07-19T14:55:35.168+00:00","modifiedAt":"2026-10-19T20:17:57.657+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/kvm/svm/sev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9b54e248d2644be71cb394eb85f31ad99e023a05\",\n                            \"lessThan\": \"5198f70c09a5f6e9e5f5a0a2c6b388f24294b176\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9b54e248d2644be71cb394eb85f31ad99e023a05\",\n                            \"lessThan\": \"75c8d1d7291268b479794fba5808971dc2f5eaf3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9b54e248d2644be71cb394eb85f31ad99e023a05\",\n                            \"lessThan\": \"505a3b94535583e4265360e2621734e355ef263d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9b54e248d2644be71cb394eb85f31ad99e023a05\",\n                            \"lessThan\": \"121d88de56bc5c0ba0ce2f6381af67f948a7e7c1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/kvm/svm/sev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.35\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.12\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.3,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/5198f70c09a5f6e9e5f5a0a2c6b388f24294b176","https://git.kernel.org/stable/c/75c8d1d7291268b479794fba5808971dc2f5eaf3","https://git.kernel.org/stable/c/505a3b94535583e4265360e2621734e355ef263d","https://git.kernel.org/stable/c/121d88de56bc5c0ba0ce2f6381af67f948a7e7c1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63938","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63938","identifiers":["CVE-2026-63938"]},"retained":false,"historicalAffected":[]}],"coverage":[]}