A glibc security update has been released for Debian GNU/Linux 11 and 12 to address a buffer overflow.

[SECURITY] [DSA 5514-1] glibc security update

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Debian Security Advisory DSA-5514-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
October 03, 2023 https://www.debian.org/security/faq
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Package : glibc
CVE ID : CVE-2023-4911

The Qualys Research Labs discovered a buffer overflow in the dynamic
loader's processing of the GLIBC_TUNABLES environment variable. An
attacker can exploit this flaw for privilege escalation.

Details can be found in the Qualys advisory at
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt

For the oldstable distribution (bullseye), this problem has been fixed
in version 2.31-13+deb11u7.

For the stable distribution (bookworm), this problem has been fixed in
version 2.36-9+deb12u3. This update includes fixes for CVE-2023-4527 and
CVE-2023-4806 originally planned for the upcoming bookworm point
release.

We recommend that you upgrade your glibc packages.

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

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/