{ "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/ubuntu18.04els/vex/2021/cve-2021-33910-els_os-ubuntu18_04els.json" } ], "title": "Security update on CVE-2021-33910", "tracking": { "current_release_date": "2026-01-19T22:46:25Z", "generator": { "date": "2026-01-19T22:46:25Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-33910-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2021-07-20T19:15:00Z", "revision_history": [ { "date": "2021-07-20T19:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-11-29T15:26:52Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" }, { "date": "2026-01-19T22:46:25Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 18.04", "product": { "name": "Ubuntu 18.04", "product_id": "Ubuntu-18", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" }, { "branches": [ { "category": "product_version", "name": "libnss-myhostname-0:237-3ubuntu10.57.amd64", "product": { "name": "libnss-myhostname-0:237-3ubuntu10.57.amd64", "product_id": "libnss-myhostname-0:237-3ubuntu10.57.amd64", "product_identification_helper": { "purl": "pkg:deb/ubuntu/libnss-myhostname@237-3ubuntu10.57?arch=amd64" } } }, { "category": "product_version", "name": "libnss-mymachines-0:237-3ubuntu10.57.amd64", "product": { "name": 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"vulnerabilities": [ { "cve": "CVE-2021-33910", "cwe": { "id": "CWE-770", "name": "Allocation of Resources Without Limits or Throttling" }, "notes": [ { "category": "description", "text": "basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.", "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" } ], "product_status": { "known_affected": [ "Ubuntu-18:libnss-myhostname-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-myhostname-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-mymachines-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-mymachines-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-resolve-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-resolve-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-systemd-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-systemd-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libpam-systemd-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libpam-systemd-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libsystemd-dev-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libsystemd-dev-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libsystemd0-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libsystemd0-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libudev-dev-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libudev-dev-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libudev1-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libudev1-0:237-3ubuntu10.57.amd64", "Ubuntu-18:systemd-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:systemd-0:237-3ubuntu10.57.amd64", "Ubuntu-18:systemd-container-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:systemd-container-0:237-3ubuntu10.57.amd64", "Ubuntu-18:systemd-coredump-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:systemd-coredump-0:237-3ubuntu10.57.amd64", "Ubuntu-18:systemd-journal-remote-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:systemd-journal-remote-0:237-3ubuntu10.57.amd64", "Ubuntu-18:systemd-sysv-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:systemd-sysv-0:237-3ubuntu10.57.amd64", "Ubuntu-18:systemd-tests-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:systemd-tests-0:237-3ubuntu10.57.amd64", "Ubuntu-18:udev-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:udev-0:237-3ubuntu10.57.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-33910" }, { "category": "external", "summary": "http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html", "url": "http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2021/08/04/2", "url": "http://www.openwall.com/lists/oss-security/2021/08/04/2" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2021/08/17/3", "url": "http://www.openwall.com/lists/oss-security/2021/08/17/3" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2021/09/07/3", "url": "http://www.openwall.com/lists/oss-security/2021/09/07/3" }, { "category": "external", "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf", "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf" }, { "category": "external", "summary": "https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b", "url": "https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b" }, { "category": "external", "summary": "https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce", "url": "https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce" }, { "category": "external", "summary": "https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538", "url": "https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538" }, { "category": "external", "summary": "https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61", "url": "https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61" }, { "category": "external", "summary": "https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b", "url": "https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b" }, { "category": "external", "summary": "https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9", "url": "https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/" }, { "category": "external", "summary": "https://security.gentoo.org/glsa/202107-48", "url": "https://security.gentoo.org/glsa/202107-48" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20211104-0008/", "url": "https://security.netapp.com/advisory/ntap-20211104-0008/" }, { "category": "external", "summary": "https://www.debian.org/security/2021/dsa-4942", "url": "https://www.debian.org/security/2021/dsa-4942" }, { "category": "external", "summary": "https://www.openwall.com/lists/oss-security/2021/07/20/2", "url": "https://www.openwall.com/lists/oss-security/2021/07/20/2" } ], "release_date": "2021-07-20T19:15:00Z", "remediations": [ { "category": "no_fix_planned", "details": "Ignored due to low severity", "product_ids": [ "Ubuntu-18:libnss-myhostname-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-myhostname-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-mymachines-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-mymachines-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-resolve-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-resolve-0:237-3ubuntu10.57.amd64", 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"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-18:libnss-myhostname-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-myhostname-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-mymachines-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-mymachines-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-resolve-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-resolve-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libnss-systemd-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libnss-systemd-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libpam-systemd-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libpam-systemd-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libsystemd-dev-0:237-3ubuntu10.57+tuxcare.els1.amd64", "Ubuntu-18:libsystemd-dev-0:237-3ubuntu10.57.amd64", "Ubuntu-18:libsystemd0-0:237-3ubuntu10.57+tuxcare.els1.amd64", 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