{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-46977", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-27T18:42:55.944Z", "datePublished": "2024-02-28T08:13:08.489Z", "dateUpdated": "2024-12-19T07:32:53.915Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-12-19T07:32:53.915Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: VMX: Disable preemption when probing user return MSRs\n\nDisable preemption when probing a user return MSR via RDSMR/WRMSR. If\nthe MSR holds a different value per logical CPU, the WRMSR could corrupt\nthe host's value if KVM is preempted between the RDMSR and WRMSR, and\nthen rescheduled on a different CPU.\n\nOpportunistically land the helper in common x86, SVM will use the helper\nin a future commit."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/include/asm/kvm_host.h", "arch/x86/kvm/vmx/vmx.c", "arch/x86/kvm/x86.c"], "versions": [{"version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "31f29749ee970c251b3a7e5b914108425940d089", "status": "affected", "versionType": "git"}, {"version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94", "status": "affected", "versionType": "git"}, {"version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "e3ea1895df719c4ef87862501bb10d95f4177bed", "status": "affected", "versionType": "git"}, {"version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "5104d7ffcf24749939bea7fdb5378d186473f890", "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/include/asm/kvm_host.h", "arch/x86/kvm/vmx/vmx.c", "arch/x86/kvm/x86.c"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.38", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.11.22", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.5", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089"}, {"url": "https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94"}, {"url": "https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed"}, {"url": "https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890"}], "title": "KVM: VMX: Disable preemption when probing user return MSRs", "x_generator": {"engine": "bippy-5f407fcff5a0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-21T16:27:41.559362Z", "id": "CVE-2021-46977", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-21T16:27:50.764Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:38.401Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:38.401Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-46977", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-21T16:27:41.559362Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-21T16:27:46.953Z"}}], "cna": {"title": "KVM: VMX: Disable preemption when probing user return MSRs", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "31f29749ee970c251b3a7e5b914108425940d089", "versionType": "git"}, {"status": "affected", "version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94", "versionType": "git"}, {"status": "affected", "version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "e3ea1895df719c4ef87862501bb10d95f4177bed", "versionType": "git"}, {"status": "affected", "version": "4be5341026246870818e28b53202b001426a5aec", "lessThan": "5104d7ffcf24749939bea7fdb5378d186473f890", "versionType": "git"}], "programFiles": ["arch/x86/include/asm/kvm_host.h", "arch/x86/kvm/vmx/vmx.c", "arch/x86/kvm/x86.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"status": "unaffected", "version": "0", "lessThan": "5.5", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.38", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.11.22", "versionType": "semver", "lessThanOrEqual": "5.11.*"}, {"status": "unaffected", "version": "5.12.5", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["arch/x86/include/asm/kvm_host.h", "arch/x86/kvm/vmx/vmx.c", "arch/x86/kvm/x86.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089"}, {"url": "https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94"}, {"url": "https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed"}, {"url": "https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890"}], "x_generator": {"engine": "bippy-5f407fcff5a0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: VMX: Disable preemption when probing user return MSRs\n\nDisable preemption when probing a user return MSR via RDSMR/WRMSR. If\nthe MSR holds a different value per logical CPU, the WRMSR could corrupt\nthe host's value if KVM is preempted between the RDMSR and WRMSR, and\nthen rescheduled on a different CPU.\n\nOpportunistically land the helper in common x86, SVM will use the helper\nin a future commit."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-12-19T07:32:53.915Z"}}}, "cveMetadata": {"cveId": "CVE-2021-46977", "state": "PUBLISHED", "dateUpdated": "2024-12-19T07:32:53.915Z", "dateReserved": "2024-02-27T18:42:55.944Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-28T08:13:08.489Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2BB4E5E8-4AAD-475A-A1B9-F287254C7D72", "versionEndExcluding": "5.10.38", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "83B53E9A-F426-4C03-9A5F-A931FF79827E", "versionEndExcluding": "5.11.22", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0274929A-B36C-4F4C-AB22-30A0DD6B995B", "versionEndExcluding": "5.12.5", "versionStartIncluding": "5.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: VMX: Disable preemption when probing user return MSRs\n\nDisable preemption when probing a user return MSR via RDSMR/WRMSR. If\nthe MSR holds a different value per logical CPU, the WRMSR could corrupt\nthe host's value if KVM is preempted between the RDMSR and WRMSR, and\nthen rescheduled on a different CPU.\n\nOpportunistically land the helper in common x86, SVM will use the helper\nin a future commit."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: KVM: VMX: deshabilite la preferencia al sondear los MSR devueltos por el usuario. Deshabilite la preferencia al sondear el MSR devuelto por un usuario a trav\u00e9s de RDSMR/WRMSR. Si MSR tiene un valor diferente por CPU l\u00f3gica, WRMSR podr\u00eda da\u00f1ar el valor del host si KVM se adelanta entre RDMSR y WRMSR y luego se reprograma en una CPU diferente. De manera oportunista, coloque el asistente en x86 com\u00fan, SVM usar\u00e1 el asistente en una confirmaci\u00f3n futura."}], "id": "CVE-2021-46977", "lastModified": "2025-01-08T17:34:32.217", "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": "2024-02-28T09:15:37.140", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed"}], "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: VMX: Disable preemption when probing user return MSRs", "id": "2266924", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266924"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-400", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: VMX: Disable preemption when probing user return MSRs\nDisable preemption when probing a user return MSR via RDSMR/WRMSR. If\nthe MSR holds a different value per logical CPU, the WRMSR could corrupt\nthe host's value if KVM is preempted between the RDMSR and WRMSR, and\nthen rescheduled on a different CPU.\nOpportunistically land the helper in common x86, SVM will use the helper\nin a future commit."], "name": "CVE-2021-46977", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46977\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46977\nhttps://lore.kernel.org/linux-cve-announce/2024022822-CVE-2021-46977-76be@gregkh/T/#u"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.10.38, kernel 5.11.22, kernel 5.12.5, kernel 5.13"}