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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/

Mailing list: debian-security-announce@lists.debian.org
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