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Test ID:
Category:Debian Local Security Checks
Title:Debian Security Advisory DSA 4564-1 (linux - security update)
Summary:The remote host is missing an update for the 'linux'; package(s) announced via the DSA-4564-1 advisory.
The remote host is missing an update for the 'linux'
package(s) announced via the DSA-4564-1 advisory.

Vulnerability Insight:
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service, or information

It was discovered that on Intel CPUs supporting hardware
virtualisation with Extended Page Tables (EPT), a guest VM may
manipulate the memory management hardware to cause a Machine Check
Error (MCE) and denial of service (hang or crash).

The guest triggers this error by changing page tables without a
TLB flush, so that both 4 KB and 2 MB entries for the same virtual
address are loaded into the instruction TLB (iTLB). This update
implements a mitigation in KVM that prevents guest VMs from
loading 2 MB entries into the iTLB. This will reduce performance
of guest VMs.

A qemu update adding support for the PSCHANGE_MC_NO feature, which
allows to disable iTLB Multihit mitigations in nested hypervisors
will be provided via DSA 4566-1.

Intel discovered that on their 8th and 9th generation GPUs,
reading certain registers while the GPU is in a low-power state
can cause a system hang. A local user permitted to use the GPU
can use this for denial of service.

This update mitigates the issue through changes to the i915

Intel discovered that their 9th generation and newer GPUs are
missing a security check in the Blitter Command Streamer (BCS). A
local user permitted to use the GPU could use this to access any
memory that the GPU has access to, which could result in a denial
of service (memory corruption or crash), a leak of sensitive
information, or privilege escalation.

This update mitigates the issue by adding the security check to
the i915 driver.

CVE-2019-11135It was discovered that on Intel CPUs supporting transactional
memory (TSX), a transaction that is going to be aborted may
continue to execute speculatively, reading sensitive data from
internal buffers and leaking it through dependent operations.
Intel calls this TSX Asynchronous Abort

For CPUs affected by the previously published Microarchitectural
Data Sa ...

Description truncated. Please see the references for more information.

Affected Software/OS:
'linux' package(s) on Debian Linux.

For the oldstable distribution (stretch), these problems have been fixed
in version 4.9.189-3+deb9u2.

For the stable distribution (buster), these problems have been fixed in
version 4.19.67-2+deb10u2.

We recommend that you upgrade your linux packages.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-0154
Bugtraq: 20191118 [slackware-security] Slackware 14.2 kernel (SSA:2019-320-01) (Google Search)
RedHat Security Advisories: RHSA-2020:0204
Common Vulnerability Exposure (CVE) ID: CVE-2019-0155
RedHat Security Advisories: RHSA-2019:3841
RedHat Security Advisories: RHSA-2019:3887
RedHat Security Advisories: RHSA-2019:3889
RedHat Security Advisories: RHSA-2019:3908
CopyrightCopyright (C) 2019 Greenbone Networks GmbH

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