| Description: | Summary:
The remote host is missing an update for the Debian 'linux-4.19' package(s) announced via the DLA-2323 advisory.
Vulnerability Insight:
Linux 4.19 has been packaged for Debian 9 as linux-4.19. This provides a supported upgrade path for systems that currently use kernel packages from the 'stretch-backports' suite.
There is no need to upgrade systems using Linux 4.9, as that kernel version will also continue to be supported in the LTS period.
This backport does not include the following binary packages:
hyperv-daemons libbpf-dev libbpf4.19 libcpupower-dev libcpupower1 liblockdep-dev liblockdep4.19 linux-compiler-gcc-6-arm linux-compiler-gcc-6-x86 linux-cpupower linux-libc-dev lockdep usbip
Older versions of most of those are built from the linux source package in Debian 9.
The kernel images and modules will not be signed for use on systems with Secure Boot enabled, as there is no support for this in Debian 9.
Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or information leak.
CVE-2019-18814
Navid Emamdoost reported a potential use-after-free in the AppArmor security module, in the case that audit rule initialisation fails. The security impact of this is unclear.
CVE-2019-18885
The bobfuzzer team discovered that crafted Btrfs volumes could trigger a crash (oops). An attacker able to mount such a volume could use this to cause a denial of service.
CVE-2019-20810
A potential memory leak was discovered in the go7007 media driver. The security impact of this is unclear.
CVE-2020-10766
Anthony Steinhauser reported a flaw in the mitigation for Speculative Store Bypass (CVE-2018-3639) on x86 CPUs. A local user could use this to temporarily disable SSB mitigation in other users' tasks. If those other tasks run sandboxed code, this would allow that code to read sensitive information in the same process but outside the sandbox.
CVE-2020-10767
Anthony Steinhauser reported a flaw in the mitigation for Spectre variant 2 (CVE-2017-5715) on x86 CPUs. Depending on which other mitigations the CPU supports, the kernel might not use IBPB to mitigate Spectre variant 2 in user-space. A local user could use this to read sensitive information from other users' processes.
CVE-2020-10768
Anthony Steinhauser reported a flaw in the mitigation for Spectre variant 2 (CVE-2017-5715) on x86 CPUs. After a task force disabled indirect branch speculation through prctl(), it could still re-enable it later, so it was not possible to override a program that explicitly enabled it.
CVE-2020-12655
Zheng Bin reported that crafted XFS volumes could trigger a system hang. An attacker able to mount such a volume could use this to cause a denial of service.
CVE-2020-12771
Zhiqiang Liu reported a bug in the bcache block driver that could lead to a system hang. The security impact of this is unclear.
CVE-2020-13974
Kyungtae Kim reported a potential integer overflow in the vt (virtual terminal) driver. The security impact of this is unclear.
CVE-2020-15393
Kyungtae Kim ... [Please see the references for more information on the vulnerabilities]
Affected Software/OS:
'linux-4.19' package(s) on Debian 9.
Solution:
Please install the updated package(s).
CVSS Score:
7.5
CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P
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