A linux security update has been released for Debian GNU/Linux 11 to address several vulnerabilities.

[SECURITY] [DSA 5453-1] linux security update

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Debian Security Advisory DSA-5453-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
July 16, 2023 https://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2023-2156 CVE-2023-31248 CVE-2023-35001

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.

CVE-2023-2156

It was discovered that a flaw in the handling of the RPL protocol
may allow an unauthenticated remote attacker to cause a denial of
service if RPL is enabled (not by default in Debian).

CVE-2023-31248

Mingi Cho discovered a use-after-free flaw in the Netfilter
nf_tables implementation when using nft_chain_lookup_byid, which may
result in local privilege escalation for a user with the
CAP_NET_ADMIN capability in any user or network namespace.

CVE-2023-35001

Tanguy DUBROCA discovered an out-of-bounds reads and write flaw in
the Netfilter nf_tables implementation when processing an
nft_byteorder expression, which may result in local privilege
escalation for a user with the CAP_NET_ADMIN capability in any user
or network namespace.

For the oldstable distribution (bullseye), these problems have been fixed
in version 5.10.179-2.

We recommend that you upgrade your linux packages.

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

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/