CVE-2021-33910

5.5 medium SSVC exploitation: none Modified

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.

Fix

Patch, vendor advisory and mitigation references on NVD 18

http://www.openwall.com/lists/oss-security/2021/08/04/2 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/17/3 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/07/3 Mailing List, Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538 Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61 Patch, Third Party Advisory
https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b Patch, Third Party Advisory
https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9 Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/04/2 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/17/3 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/07/3 Mailing List, Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538 Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61 Patch, Third Party Advisory
https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b Patch, Third Party Advisory
https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9 Patch, Third Party Advisory

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

2026-10-15 00:45First seenCVSS 5.5 · systemd_project, fedoraproject, debianNVD modified 2026-10-14 12:17

Affected (CPE criteria) 6

cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*

References 36

http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html Exploit, Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/08/04/2 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/17/3 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/07/3 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538 Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61 Patch, Third Party Advisory
https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b Patch, Third Party Advisory
https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9 Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/
https://security.gentoo.org/glsa/202107-48 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0008/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4942 Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/07/20/2 Exploit, Mailing List, Third Party Advisory
http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html Exploit, Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/08/04/2 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/17/3 Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/07/3 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538 Patch, Third Party Advisory
https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61 Patch, Third Party Advisory
https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b Patch, Third Party Advisory
https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9 Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/
https://security.gentoo.org/glsa/202107-48 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0008/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4942 Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/07/20/2 Exploit, Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-222547.html
https://cert-portal.siemens.com/productcert/html/ssa-398330.html