CVE-2021-3748

{"containers": {"cna": {"affected": [{"product": "QEMU (virtio-net)", "vendor": "n/a", "versions": [{"status": "affected", "version": "Affects qemu v0.10.0 and above, Fixed In \u2013 v6.2.0-rc0 and above."}]}], "descriptions": [{"lang": "en", "value": "A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-416", "description": "CWE-416 - Use After Free", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-09-05T05:06:41.000Z", "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514"}, {"tags": ["x_refsource_MISC"], "url": "https://ubuntu.com/security/CVE-2021-3748"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"}, {"tags": ["x_refsource_MISC"], "url": "https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html"}, {"name": "[debian-lts-announce] 20220404 [SECURITY] [DLA 2970-1] qemu security update", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://security.netapp.com/advisory/ntap-20220425-0004/"}, {"name": "GLSA-202208-27", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202208-27"}, {"name": "[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "secalert@redhat.com", "ID": "CVE-2021-3748", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "QEMU (virtio-net)", "version": {"version_data": [{"version_value": "Affects qemu v0.10.0 and above, Fixed In \u2013 v6.2.0-rc0 and above."}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-416 - Use After Free"}]}]}, "references": {"reference_data": [{"name": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514", "refsource": "MISC", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514"}, {"name": "https://ubuntu.com/security/CVE-2021-3748", "refsource": "MISC", "url": "https://ubuntu.com/security/CVE-2021-3748"}, {"name": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6", "refsource": "MISC", "url": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"}, {"name": "https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html", "refsource": "MISC", "url": "https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html"}, {"name": "[debian-lts-announce] 20220404 [SECURITY] [DLA 2970-1] qemu security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html"}, {"name": "https://security.netapp.com/advisory/ntap-20220425-0004/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20220425-0004/"}, {"name": "GLSA-202208-27", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202208-27"}, {"name": "[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:09:08.293Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://ubuntu.com/security/CVE-2021-3748"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html"}, {"name": "[debian-lts-announce] 20220404 [SECURITY] [DLA 2970-1] qemu security update", "tags": ["mailing-list", "x_refsource_MLIST", "x_transferred"], "url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20220425-0004/"}, {"name": "GLSA-202208-27", "tags": ["vendor-advisory", "x_refsource_GENTOO", "x_transferred"], "url": "https://security.gentoo.org/glsa/202208-27"}, {"name": "[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update", "tags": ["mailing-list", "x_refsource_MLIST", "x_transferred"], "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"}]}]}, "cveMetadata": {"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "assignerShortName": "redhat", "cveId": "CVE-2021-3748", "datePublished": "2022-03-23T19:46:40.000Z", "dateReserved": "2021-08-30T00:00:00.000Z", "dateUpdated": "2024-08-03T17:09:08.293Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "QEMU (virtio-net)", "vendor": "n/a", "versions": [{"status": "affected", "version": "Affects qemu v0.10.0 and above, Fixed In \u2013 v6.2.0-rc0 and above."}]}], "source": "secalert@redhat.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*", "matchCriteriaId": "69067884-3C1C-4933-8955-489BC2EB5BD5", "versionEndExcluding": "6.2.0", "versionStartIncluding": "0.10.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252", "vulnerable": true}, {"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*", "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*", "matchCriteriaId": "AAE4D2D0-CEEB-416F-8BC5-A7987DF56190", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*", "matchCriteriaId": "3AA08768-75AF-4791-B229-AE938C780959", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:*:*:*:*:*:*:*", "matchCriteriaId": "04F853F5-C907-48A3-BDED-2AC3923E4010", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process."}, {"lang": "es", "value": "Se ha encontrado una vulnerabilidad de uso de memoria previamente liberada en el dispositivo virtio-net de QEMU. Podr\u00eda ocurrir cuando la direcci\u00f3n del descriptor pertenece a la regi\u00f3n de acceso no directo, debido a que num_buffers es establecido despu\u00e9s de que el elemento virtqueue haya sido desmapeado. Un hu\u00e9sped malicioso podr\u00eda usar este fallo para bloquear QEMU, resultando en una condici\u00f3n de denegaci\u00f3n de servicio, o potencialmente ejecutar c\u00f3digo en el host con los privilegios del proceso QEMU"}], "id": "CVE-2021-3748", "lastModified": "2026-06-17T04:05:41.413", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 6.9, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 6.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-03-23T20:15:09.893", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-27"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220425-0004/"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://ubuntu.com/security/CVE-2021-3748"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-27"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220425-0004/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://ubuntu.com/security/CVE-2021-3748"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Alexander Bulekov for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:5036", "cpe": "cpe:/a:redhat:advanced_virtualization:8.2::el8", "package": "virt:8.2-8020120211120005046.863bb0db", "product_name": "Advanced Virtualization for RHEL 8.2.1", "release_date": "2021-12-09T00:00:00Z"}, {"advisory": "RHSA-2021:5036", "cpe": "cpe:/a:redhat:advanced_virtualization:8.2::el8", "package": "virt-devel:8.2-8020120211120005046.863bb0db", "product_name": "Advanced Virtualization for RHEL 8.2.1", "release_date": "2021-12-09T00:00:00Z"}, {"advisory": "RHSA-2021:4112", "cpe": "cpe:/a:redhat:advanced_virtualization:8.4::el8", "package": "virt:av-8040020211022000504.522a0ee4", "product_name": "Advanced Virtualization for RHEL 8.4.0.Z", "release_date": "2021-11-03T00:00:00Z"}, {"advisory": "RHSA-2021:4112", "cpe": "cpe:/a:redhat:advanced_virtualization:8.4::el8", "package": "virt-devel:av-8040020211022000504.522a0ee4", "product_name": "Advanced Virtualization for RHEL 8.4.0.Z", "release_date": "2021-11-03T00:00:00Z"}, {"advisory": "RHSA-2022:1759", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "virt-devel:rhel-8060020220408104655.d63f516d", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:1759", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "virt:rhel-8060020220408104655.d63f516d", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}], "bugzilla": {"description": "QEMU: virtio-net: heap use-after-free in virtio_net_receive_rcu", "id": "1998514", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998514"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.", "A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-3748", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "qemu-kvm", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "qemu-kvm", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "qemu-kvm-ma", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Affected", "package_name": "virt:8.2/qemu-kvm", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Affected", "package_name": "virt:av/qemu-kvm", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "qemu-kvm", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Out of support scope", "package_name": "qemu-kvm-rhev", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Out of support scope", "package_name": "qemu-kvm-rhev", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2021-08-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3748\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3748"], "statement": "This issue affects the versions of `qemu-kvm` as shipped with Red Hat Enterprise Linux 8 and Red Hat Enterprise Linux 8 Advanced Virtualization. A future update may address this flaw.", "threat_severity": "Moderate"}

{}