{ "document": { "aggregate_severity": { "text": "Medium" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/vex/2021/cve-2021-4115-els_os-ubuntu16_04els.json" } ], "title": "Security update on CVE-2021-4115", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-4115-ELS_OS-UBUNTU16.04ELS", "initial_release_date": "2021-01-01T00:00:00Z", "revision_history": [ { "date": "2021-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-11-29T18:52:14Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 16.04", "product": { "name": "Ubuntu 16.04", "product_id": "Ubuntu-16", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/libpolkit-backend-1-dev@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-4115", "cwe": { "id": "CWE-400", "name": "Uncontrolled Resource Consumption" }, "notes": [ { "category": "description", "text": "There is a flaw in polkit which can allow an unprivileged user to cause polkit to crash, due to process file descriptor exhaustion. The highest threat from this vulnerability is to availability. NOTE: Polkit process outage duration is tied to the failing process being reaped and a new one being spawned", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-4115" }, { "category": "external", "summary": "http://packetstormsecurity.com/files/172849/polkit-File-Descriptor-Exhaustion.html", "url": "http://packetstormsecurity.com/files/172849/polkit-File-Descriptor-Exhaustion.html" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/cve-2021-4115", "url": "https://access.redhat.com/security/cve/cve-2021-4115" }, { "category": "external", "summary": "https://gitlab.com/redhat/centos-stream/rpms/polkit/-/merge_requests/6/diffs?commit_id=bf900df04dc390d389e59aa10942b0f2b15c531e", "url": "https://gitlab.com/redhat/centos-stream/rpms/polkit/-/merge_requests/6/diffs?commit_id=bf900df04dc390d389e59aa10942b0f2b15c531e" }, { "category": "external", "summary": "https://gitlab.freedesktop.org/polkit/polkit/-/issues/141", "url": "https://gitlab.freedesktop.org/polkit/polkit/-/issues/141" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGKWCBS6IDZYYDYM2WIWJM5BL7QQTWPF/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGKWCBS6IDZYYDYM2WIWJM5BL7QQTWPF/" }, { "category": "external", "summary": "https://www.oracle.com/security-alerts/cpujul2022.html", "url": "https://www.oracle.com/security-alerts/cpujul2022.html" } ], "release_date": "2022-02-21T22:15:00Z", "scores": [ { "cvss_v2": { "accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0" }, "cvss_v3": { "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" }, "products": [ "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "details": "moderate", "product_ids": [ "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" ] } ] } ] }