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Debian LTS Advisory DLA-3512-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Ben Hutchings
August 2, 2023 https://wiki.debian.org/LTS
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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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