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- ------------------------------------------------------------------------- Debian Security Advisory DSA-4698-1 [email protected] https://www.debian.org/security/ Ben Hutchings
June 09, 2020 https://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2019-2182 CVE-2019-5108 CVE-2019-19319 CVE-2019-19462
CVE-2019-19768 CVE-2019-20806 CVE-2019-20811 CVE-2020-0543
CVE-2020-2732 CVE-2020-8428 CVE-2020-8647 CVE-2020-8648
CVE-2020-8649 CVE-2020-9383 CVE-2020-10711 CVE-2020-10732
CVE-2020-10751 CVE-2020-10757 CVE-2020-10942 CVE-2020-11494
CVE-2020-11565 CVE-2020-11608 CVE-2020-11609 CVE-2020-11668
CVE-2020-12114 CVE-2020-12464 CVE-2020-12652 CVE-2020-12653
CVE-2020-12654 CVE-2020-12770 CVE-2020-13143
Debian Bug : 952660

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

CVE-2019-2182

Hanjun Guo and Lei Li reported a race condition in the arm64
virtual memory management code, which could lead to an information
disclosure, denial of service (crash), or possibly privilege
escalation.

CVE-2019-5108

Mitchell Frank of Cisco discovered that when the IEEE 802.11
(WiFi) stack was used in AP mode with roaming, it would trigger
roaming for a newly associated station before the station was
authenticated. An attacker within range of the AP could use this
to cause a denial of service, either by filling up a switching
table or by redirecting traffic away from other stations.

CVE-2019-19319

Jungyeon discovered that a crafted filesystem can cause the ext4
implementation to deallocate or reallocate journal blocks. A user
permitted to mount filesystems could use this to cause a denial of
service (crash), or possibly for privilege escalation.

CVE-2019-19462

The syzbot tool found a missing error check in the 'relay'
library used to implement various files under debugfs. A local
user permitted to access debugfs could use this to cause a denial
of service (crash) or possibly for privilege escalation.

CVE-2019-19768

Tristan Madani reported a race condition in the blktrace debug
facility that could result in a use-after-free. A local user able
to trigger removal of block devices could possibly use this to
cause a denial of service (crash) or for privilege escalation.

CVE-2019-20806

A potential null pointer dereference was discovered in the tw5864
media driver. The security impact of this is unclear.

CVE-2019-20811

The Hulk Robot tool found a reference-counting bug in an error
path in the network subsystem. The security impact of this is
unclear.

CVE-2020-0543

Researchers at VU Amsterdam discovered that on some Intel CPUs
supporting the RDRAND and RDSEED instructions, part of a random
value generated by these instructions may be used in a later
speculative execution on any core of the same physical CPU.
Depending on how these instructions are used by applications, a
local user or VM guest could use this to obtain sensitive
information such as cryptographic keys from other users or VMs.

This vulnerability can be mitigated by a microcode update, either
as part of system firmware (BIOS) or through the intel-microcode
package in Debian's non-free archive section. This kernel update
only provides reporting of the vulnerability and the option to
disable the mitigation if it is not needed.

CVE-2020-2732

Paulo Bonzini discovered that the KVM implementation for Intel
processors did not properly handle instruction emulation for L2
guests when nested virtualization is enabled. This could allow an
L2 guest to cause privilege escalation, denial of service, or
information leaks in the L1 guest.

CVE-2020-8428

Al Viro discovered a potential use-after-free in the filesystem
core (vfs). A local user could exploit this to cause a denial of
service (crash) or possibly to obtain sensitive information from
the kernel.

CVE-2020-8647, CVE-2020-8649

The Hulk Robot tool found a potential MMIO out-of-bounds access in
the vgacon driver. A local user permitted to access a virtual
terminal (/dev/tty1 etc.) on a system using the vgacon driver
could use this to cause a denial of service (crash or memory
corruption) or possibly for privilege escalation.

CVE-2020-8648

The syzbot tool found a race condition in the the virtual terminal
driver, which could result in a use-after-free. A local user
permitted to access a virtual terminal could use this to cause a
denial of service (crash or memory corruption) or possibly for
privilege escalation.

CVE-2020-9383

Jordy Zomer reported an incorrect range check in the floppy driver
which could lead to a static out-of-bounds access. A local user

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