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Debian Security Advisory DSA-4444-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
May 14, 2019 https://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091
Debian Bug : 928125

Multiple researchers have discovered vulnerabilities in the way the
Intel processor designs have implemented speculative forwarding of data
filled into temporary microarchitectural structures (buffers). This
flaw could allow an attacker controlling an unprivileged process to
read sensitive information, including from the kernel and all other
processes running on the system or cross guest/host boundaries to read
host memory.

See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
for more details.

To fully resolve these vulnerabilities it is also necessary to install
updated CPU microcode. An updated intel-microcode package (only
available in Debian non-free) will be provided via a separate DSA. The
updated CPU microcode may also be available as part of a system firmware
(“BIOS”) update.

In addition, this update includes a fix for a regression causing
deadlocks inside the loopback driver, which was introduced by the update
to 4.9.168 in the last Stretch point release.

For the stable distribution (stretch), these problems have been fixed in
version 4.9.168-1+deb9u2.

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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