{"api_version":"1","generated_at":"2026-04-23T00:19:57+00:00","cve":"CVE-2022-33740","urls":{"html":"https://cve.report/CVE-2022-33740","api":"https://cve.report/api/cve/CVE-2022-33740.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-33740","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-33740"},"summary":{"title":"CVE-2022-33740","description":"Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742).","state":"PUBLIC","assigner":"security@xen.org","published_at":"2022-07-05 13:15:00","updated_at":"2023-11-07 03:48:00"},"problem_types":["CWE-212"],"metrics":[],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-403.txt","name":"https://xenbits.xenproject.org/xsa/advisory-403.txt","refsource":"MISC","tags":[],"title":"","mime":"text/plain","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGFTRZ66KQYTSYIRT5FRHF5D6O72NWOP/","name":"FEDORA-2022-c4ec706488","refsource":"","tags":[],"title":"[SECURITY] Fedora 36 Update: xen-4.16.1-5.fc36 - package-announce - Fedora 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for xen (SUSE-SU-2022:3928-1)"},{"cve":"CVE-2022-33740","qid":"753148","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2615-1)"},{"cve":"CVE-2022-33740","qid":"753156","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2741-1)"},{"cve":"CVE-2022-33740","qid":"753316","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2892-1)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@xen.org","ID":"CVE-2022-33740","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Linux","version":{"version_data":[{"version_affected":"?","version_value":"consult Xen advisory XSA-403"}]}}]},"vendor_name":"Linux"},{"product":{"product_data":[{"product_name":"xen","version":{"version_data":[{"version_affected":"?","version_value":"consult Xen advisory XSA-403"}]}}]},"vendor_name":"Xen"}]}},"configuration":{"configuration_data":{"description":{"description_data":[{"lang":"eng","value":"All Linux guests using PV devices are vulnerable in case potentially\nmalicious PV device backends are being used."}]}}},"credit":{"credit_data":{"description":{"description_data":[{"lang":"eng","value":"The issue related to not zeroing memory areas used for shared communications\nwas discovered by Roger Pau Monné of Citrix.\n\nThe issue related to leaking contiguous data in granted pages was disclosed\npublicly."}]}}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742)."}]},"impact":{"impact_data":{"description":{"description_data":[{"lang":"eng","value":"An untrusted backend can access data not intended to be shared.  If such\nmappings are made with write permissions the backend could also cause\nmalfunctions and/or crashes to consumers of contiguous data in the shared\npages."}]}}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"unknown"}]}]},"references":{"reference_data":[{"url":"https://xenbits.xenproject.org/xsa/advisory-403.txt","refsource":"MISC","name":"https://xenbits.xenproject.org/xsa/advisory-403.txt"},{"refsource":"CONFIRM","name":"http://xenbits.xen.org/xsa/advisory-403.html","url":"http://xenbits.xen.org/xsa/advisory-403.html"},{"refsource":"MLIST","name":"[oss-security] 20220705 Xen Security Advisory 403 v3 (CVE-2022-26365,CVE-2022-33740,CVE-2022-33741,CVE-2022-33742) - Linux disk/nic frontends data leaks","url":"http://www.openwall.com/lists/oss-security/2022/07/05/6"},{"refsource":"FEDORA","name":"FEDORA-2022-c4ec706488","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IGFTRZ66KQYTSYIRT5FRHF5D6O72NWOP/"},{"refsource":"FEDORA","name":"FEDORA-2022-2c9f8224f8","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/"},{"refsource":"DEBIAN","name":"DSA-5191","url":"https://www.debian.org/security/2022/dsa-5191"},{"refsource":"MLIST","name":"[debian-lts-announce] 20221002 [SECURITY] [DLA 3131-1] linux security update","url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html"}]},"workaround":{"workaround_data":{"description":{"description_data":[{"lang":"eng","value":"There is no mitigation available other than not using PV devices in case\na backend is suspected to be potentially malicious."}]}}}},"nvd":{"publishedDate":"2022-07-05 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