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Debian LTS: Security Advisory for linux-4.19 (DLA-2385-1)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'linux-4.19' package(s) announced via the DLA-2385-1 advisory.
Insight
Insight
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service, or information leak. CVE-2019-3874 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) driver allowed users to disable a device's memory space while it was still mapped into a process. On some hardware platforms, local users or guest virtual machines permitted to access PCIe Virtual Functions could use this to cause a denial of service (hardware error and crash). CVE-2020-14314 A bug was discovered in the ext4 filesystem that could lead to an out-of-bound read. A local user permitted to mount and access arbitrary filesystem images could use this to cause a denial of service (crash). CVE-2020-14331 A bug was discovered in the VGA console driver's soft-scrollback feature that could lead to a heap buffer overflow. On a system with a custom kernel that has CONFIG_VGACON_SOFT_SCROLLBACK enabled, a local user with access to a console could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2020-14356 A bug was discovered in the cgroup subsystem's handling of socket references to cgroups. In some cgroup configurations, this could lead to a use-after-free. A local user might be able to use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2020-14385 A bug was discovered in XFS, which could lead to an extended attribute (xattr) wrongly being detected as invalid. A local user with access to an XFS filesystem could use this to cause a denial of service (filesystem shutdown). CVE-2020-14386 Or Cohen discovered a bug in the packet socket (AF_PACKET) implementation which could lead to a heap buffer overflow. A local ... Description truncated. Please see the references for more information.
Affected Software
Affected Software
'linux-4.19' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 9 stretch, these problems have been fixed in version 4.19.146-1~deb9u1. This update additionally fixes Debian bugs #966846, #966917, and #968567, and includes many more bug fixes from stable updates 4.19.133-4.19.146 inclusive. We recommend that you upgrade your linux-4.19 packages.