--- id: CVE-2021-33910 title: >- 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 c… summary: >- 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 c… severity: medium cvss: 5.5 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-770 - CWE-770 vendor: systemd_project product: systemd affected: - systemd < 246.15 - 'systemd >= 247, < 247.8' - 'systemd >= 248, < 248.5' - 'systemd >= 249, < 249.1' - fedora = 33 - fedora = 34 - debian_linux = 10.0 - hci_management_node - solidfire patched: - systemd 249.1 published: '2021-07-20' updated: '2026-10-14' sourceUpdated: '2026-10-14T12:17:12.877' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-33910' references: - url: >- http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html label: cve@mitre.org - url: 'http://www.openwall.com/lists/oss-security/2021/08/04/2' label: cve@mitre.org - url: 'http://www.openwall.com/lists/oss-security/2021/08/17/3' label: cve@mitre.org - url: 'http://www.openwall.com/lists/oss-security/2021/09/07/3' label: cve@mitre.org - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf' label: cve@mitre.org - url: >- https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b label: cve@mitre.org - url: >- https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce label: cve@mitre.org - url: >- https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538 label: cve@mitre.org - url: >- https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61 label: cve@mitre.org - url: >- https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b label: cve@mitre.org - url: >- https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9 label: cve@mitre.org - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/ label: cve@mitre.org - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/ label: cve@mitre.org - url: 'https://security.gentoo.org/glsa/202107-48' label: cve@mitre.org - url: 'https://security.netapp.com/advisory/ntap-20211104-0008/' label: cve@mitre.org - url: 'https://www.debian.org/security/2021/dsa-4942' label: cve@mitre.org - url: 'https://www.openwall.com/lists/oss-security/2021/07/20/2' label: cve@mitre.org - url: >- http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2021/08/04/2' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2021/08/17/3' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2021/09/07/3' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9 label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.gentoo.org/glsa/202107-48' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20211104-0008/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2021/dsa-4942' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.openwall.com/lists/oss-security/2021/07/20/2' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-222547.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e tags: - nvd epss: 0.08792 epssPercentile: 0.95081 ingestedAt: '2026-10-14T12:29:10.822Z' --- ## Overview 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. ## Affected - `systemd < 246.15` - `systemd >= 247, < 247.8` - `systemd >= 248, < 248.5` - `systemd >= 249, < 249.1` - `fedora = 33` - `fedora = 34` - `debian_linux = 10.0` - `hci_management_node` - `solidfire` ## Remediation Upgrade past the affected range: - `systemd 249.1`