{"containers": {"cna": {"affected": [{"platforms": ["PPC Power8"], "product": "Linux kernel", "vendor": "Linux kernel", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "4.8", "versionType": "custom"}, {"lessThan": "4.18", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Gustavo Romero"}, {"lang": "en", "value": "Paul Mackerras"}], "datePublic": "2020-04-06T00:00:00", "descriptions": [{"lang": "en", "value": "KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\") 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\") 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")"}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-368", "description": "CWE-368", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2020-04-23T15:06:26", "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://www.openwall.com/lists/oss-security/2020/04/06/2"}, {"tags": ["x_refsource_MISC"], "url": "https://usn.ubuntu.com/usn/usn-4318-1"}, {"tags": ["x_refsource_MISC"], "url": "https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"}, {"name": "USN-4318-1", "tags": ["vendor-advisory", "x_refsource_UBUNTU"], "url": "https://usn.ubuntu.com/4318-1/"}, {"name": "openSUSE-SU-2020:0543", "tags": ["vendor-advisory", "x_refsource_SUSE"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html"}], "solutions": [{"lang": "en", "value": "Apply the following three Linux kernel commits, though possibly only the first commit is strictly necessary: \n \n 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\")\n 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\")\n 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")"}], "source": {"defect": ["https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"], "discovery": "EXTERNAL"}, "title": "Linux kernel KVM Power8 conflicting use of HSTATE_HOST_R1", "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@ubuntu.com", "DATE_PUBLIC": "2020-04-06T16:00:00.000Z", "ID": "CVE-2020-8834", "STATE": "PUBLIC", "TITLE": "Linux kernel KVM Power8 conflicting use of HSTATE_HOST_R1"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Linux kernel", "version": {"version_data": [{"platform": "PPC Power8", "version_affected": ">=", "version_value": "4.8"}, {"platform": "PPC Power8", "version_affected": "<", "version_value": "4.18"}]}}]}, "vendor_name": "Linux kernel"}]}}, "credit": [{"lang": "eng", "value": "Gustavo Romero"}, {"lang": "eng", "value": "Paul Mackerras"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\") 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\") 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")"}]}, "generator": {"engine": "Vulnogram 0.0.9"}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-368"}]}]}, "references": {"reference_data": [{"name": "https://www.openwall.com/lists/oss-security/2020/04/06/2", "refsource": "MISC", "url": "https://www.openwall.com/lists/oss-security/2020/04/06/2"}, {"name": "https://usn.ubuntu.com/usn/usn-4318-1", "refsource": "MISC", "url": "https://usn.ubuntu.com/usn/usn-4318-1"}, {"name": "https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717", "refsource": "MISC", "url": "https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"}, {"name": "USN-4318-1", "refsource": "UBUNTU", "url": "https://usn.ubuntu.com/4318-1/"}, {"name": "openSUSE-SU-2020:0543", "refsource": "SUSE", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html"}]}, "solution": [{"lang": "en", "value": "Apply the following three Linux kernel commits, though possibly only the first commit is strictly necessary: \n \n 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\")\n 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\")\n 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")"}], "source": {"defect": ["https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"], "discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T10:12:10.661Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.openwall.com/lists/oss-security/2020/04/06/2"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://usn.ubuntu.com/usn/usn-4318-1"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717"}, {"name": "USN-4318-1", "tags": ["vendor-advisory", "x_refsource_UBUNTU", "x_transferred"], "url": "https://usn.ubuntu.com/4318-1/"}, {"name": "openSUSE-SU-2020:0543", "tags": ["vendor-advisory", "x_refsource_SUSE", "x_transferred"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html"}]}]}, "cveMetadata": {"assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "assignerShortName": "canonical", "cveId": "CVE-2020-8834", "datePublished": "2020-04-09T22:10:14.975025Z", "dateReserved": "2020-02-10T00:00:00", "dateUpdated": "2024-09-16T22:03:01.562Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

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Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\") 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\") 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")"}, {"lang": "es", "value": "KVM en el kernel de Linux en los procesadores Power8, presenta un uso conflictivo de HSTATE_HOST_R1 para almacenar el estado r1 en plus kvmppc_hv_entry en kvmppc_ {save, restore} _tm, conllevando a una corrupci\u00f3n de la pila. Debido a esto, un atacante con la capacidad de ejecutar c\u00f3digo en el espacio del kernel de una M\u00e1quina Virtual invitada puede causar que el kernel del host entre en p\u00e1nico. Se presentaron dos commits que, de acuerdo con el reportero, introdujeron la vulnerabilidad: f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") El primero se consigui\u00f3 en la versi\u00f3n 4.8, el \u00faltimo en la versi\u00f3n 4.17. 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{"acknowledgement": "Red Hat would like to thank Gustavo Romero and Paul Mackerras for reporting this issue.", "affected_release": [{"advisory": "RHSA-2020:2854", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-alt-0:4.14.0-115.26.1.el7a", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-07-07T00:00:00Z"}], "bugzilla": {"description": "Kernel: ppc: kvm: conflicting use of HSTATE_HOST_R1 to store r1 state leads to host stack corruption", "id": "1819615", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1819615"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-121", "details": ["KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\") 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\") 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")", "A flaw was found in the way the KVM hypervisor on the Power8 processor stores the r1 register state in the 'HSTATE_HOST_R1' field on the Linux kernel stack. This flaw occurs while handling hypercalls in Transactional Memory (TM) suspend mode in the kvmppc_save_tm and kvmppc_restore_tm routines, leading to host stack corruption. R1 register holds a stack frame address and its corruption leads the kernel into panic state. A guest user can use this flaw to crash the host kernel, resulting in a denial of service."], "name": "CVE-2020-8834", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"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": "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:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-04-06T16:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-8834\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-8834\nhttps://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717\nhttps://www.openwall.com/lists/oss-security/2020/04/06/2"], "statement": "This issue does not affect the versions of the Linux kernel as shipped with the Red Hat Enterprise Linux 5, 6, 8 and Red Hat Enterprise MRG 2.\nThis issue affects the versions of the kernel package as shipped with the Red Hat Enterprise Linux 7. Future kernel updates for the Red Hat Enterprise Linux 7 may address this issue.", "threat_severity": "Important", "upstream_fix": "Linux 4.18"}