A systemd security update has been released for Debian GNU/Linux 10 to address an attacker-controlled allocation using the alloca() function could result in memory corruption.

DSA 4942-1: systemd security update

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Debian Security Advisory DSA-4942-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
July 20, 2021   https://www.debian.org/security/faq
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Package : systemd
CVE ID : CVE-2021-33910

The Qualys Research Labs discovered that an attacker-controlled
allocation using the alloca() function could result in memory
corruption, allowing to crash systemd and hence the entire operating
system.

Details can be found in the Qualys advisory at
  https://www.qualys.com/2021/07/20/cve-2021-33910/denial-of-service-systemd.txt

For the stable distribution (buster), this problem has been fixed in
version 241-7~deb10u8.

We recommend that you upgrade your systemd packages.

For the detailed security status of systemd please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/systemd

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/