A linux kernel security update has been released for Debian GNU/Linux 11 and 12 to address a hardware vulnerability for Intel CPUs.

[SECURITY] [DSA 5475-1] linux security update

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Debian Security Advisory DSA-5475-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
August 11, 2023 https://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2022-40982 CVE-2023-20569

CVE-2022-40982

Daniel Moghimi discovered Gather Data Sampling (GDS), a hardware
vulnerability for Intel CPUs which allows unprivileged speculative
access to data which was previously stored in vector registers.

This mitigation requires updated CPU microcode provided in the
intel-microcode package.

For details please refer to
( https://downfall.page/) and
( https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/gather-data-sampling.html) .

CVE-2023-20569

Daniel Trujillo, Johannes Wikner and Kaveh Razavi discovered
INCEPTION, also known as Speculative Return Stack Overflow (SRSO),
a transient execution attack that leaks arbitrary data on all AMD
Zen CPUs. An attacker can mis-train the CPU BTB to predict non-
architectural CALL instructions in kernel space and use this to
control the speculative target of a subsequent kernel RET,
potentially leading to information disclosure via a speculative
side-channel.

For details please refer to
( https://comsec.ethz.ch/research/microarch/inception/) and
( https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-7005) .

For the oldstable distribution (bullseye), these problems have been fixed
in version 5.10.179-5.

For the stable distribution (bookworm), these problems have been fixed in
version 6.1.38-4.

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/