[SECURITY] [DLA 3512-1] linux-5.10 security update

Debian LTS Advisory DLA-3512-1 [email protected]
https://www.debian.org/lts/security/ Ben Hutchings
August 2, 2023 https://wiki.debian.org/LTS

Package : linux-5.10
Version : 5.10.179-3~deb10u1
CVE ID : CVE-2023-2156 CVE-2023-3390 CVE-2023-3610 CVE-2023-20593
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-2023-3390

A use-after-free flaw in the netfilter subsystem caused by
incorrect error path handling may result in denial of service or
privilege escalation.

CVE-2023-3610

A use-after-free flaw in the netfilter subsystem caused by
incorrect refcount handling on the table and chain destroy path
may result in denial of service or privilege escalation.

CVE-2023-20593

Tavis Ormandy discovered that under specific microarchitectural
circumstances, a vector register in AMD "Zen 2" CPUs may not be
written to 0 correctly.  This flaw allows an attacker to leak
sensitive information across concurrent processes, hyper threads
and virtualized guests.

For details please refer to
<https://lock.cmpxchg8b.com/zenbleed.html> and
<https://github.com/google/security-research/security/advisories/GHSA-v6wh-rxpg-cmm8>.

This issue can also be mitigated by a microcode update through the
amd64-microcode package or a system firmware (BIOS/UEFI) update.
However, the initial microcode release by AMD only provides
updates for second generation EPYC CPUs.  Various Ryzen CPUs are
also affected, but no updates are available yet.

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 Debian 10 buster, these problems have been fixed in version
5.10.179-3~deb10u1.

We recommend that you upgrade your linux-5.10 packages.

For the detailed security status of linux-5.10 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/linux-5.10

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