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Debian: DLA-2385-1 Critical: linux-4.19 Denial Of Service Risks

debian lts
Calendar Grey September 28, 2020
Dist Debian Esm H88
Ubuntu LTS USN-4967-1 tackles various vulnerabilities, encompassing unauthorized access and service disruption in the Linux kernel version 5.4.
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service, or information leak

Summary

Kernel buffers allocated by the SCTP network protocol were not
limited by the memory cgroup controller. A local user could
potentially use this to evade container memory limits and to cause
a denial of service (excessive memory use).

CVE-2019-19448, CVE-2019-19813, CVE-2019-19816

"Team bobfuzzer" reported bugs in Btrfs that could lead to a
use-after-free or heap buffer overflow, and could be triggered by
crafted filesystem images. A user permitted to mount and access
arbitrary filesystems could use these to cause a denial of service
(crash or memory corruption) or possibly for privilege escalation.

CVE-2020-10781

Luca Bruno of Red Hat discovered that the zram control file
/sys/class/zram-control/hot_add was readable by all users. On a
system with zram enabled, a local user could use this to cause a
denial of service (memory exhaustion).

CVE-2020-12888

It was discovered that the PCIe Virtual Function I/O (vfio-pci)

Read the Full Advisory


Severity
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-------------------------------------------------------------------------Package: linux-4.19
Version: 4.19.146-1~deb9u1
CVE ID: CVE-2019-3874 CVE-2019-19448 CVE-2019-19813 CVE-2019-19816
Debian Bug: 966846 966917 968567

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