Amazon Linux 2 Security Advisory: ALAS-2020-1405
Advisory Release Date: 2020-03-23 16:25 Pacific
Advisory Updated Date: 2023-11-29 22:19 Pacific
FAQs regarding Amazon Linux ALAS/CVE Severity
2023-11-29: CVE-2020-27418 was added to this advisory.
A stack buffer overflow issue was found in the get_raw_socket() routine of the Host kernel accelerator for virtio net (vhost-net) driver. It could occur while doing an ictol(VHOST_NET_SET_BACKEND) call, and retrieving socket name in a kernel stack variable via get_raw_socket(). A user able to perform ioctl(2) calls on the '/dev/vhost-net' device may use this flaw to crash the kernel resulting in DoS issue. (CVE-2020-10942)
A flaw was found in the way KVM hypervisor handled instruction emulation for the L2 guest when nested(=1) virtualization is enabled. In the instruction emulation, the L2 guest could trick the L0 hypervisor into accessing sensitive bits of the L1 hypervisor. An L2 guest could use this flaw to potentially access information of the L1 hypervisor. (CVE-2020-2732)
A Use After Free vulnerability in Fedora Linux kernel 5.9.0-rc9 allows attackers to obatin sensitive information via vgacon_invert_region() function. (CVE-2020-27418)
A use-after-free flaw was found in the Linux kernel console driver when using the copy-paste buffer. This flaw allows a local user to crash the system. (CVE-2020-8648)
Affected Packages:
kernel
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update kernel to update your system.
aarch64:
kernel-4.14.173-137.228.amzn2.aarch64
kernel-headers-4.14.173-137.228.amzn2.aarch64
kernel-debuginfo-common-aarch64-4.14.173-137.228.amzn2.aarch64
perf-4.14.173-137.228.amzn2.aarch64
perf-debuginfo-4.14.173-137.228.amzn2.aarch64
python-perf-4.14.173-137.228.amzn2.aarch64
python-perf-debuginfo-4.14.173-137.228.amzn2.aarch64
kernel-tools-4.14.173-137.228.amzn2.aarch64
kernel-tools-devel-4.14.173-137.228.amzn2.aarch64
kernel-tools-debuginfo-4.14.173-137.228.amzn2.aarch64
kernel-devel-4.14.173-137.228.amzn2.aarch64
kernel-debuginfo-4.14.173-137.228.amzn2.aarch64
i686:
kernel-headers-4.14.173-137.228.amzn2.i686
src:
kernel-4.14.173-137.228.amzn2.src
x86_64:
kernel-4.14.173-137.228.amzn2.x86_64
kernel-headers-4.14.173-137.228.amzn2.x86_64
kernel-debuginfo-common-x86_64-4.14.173-137.228.amzn2.x86_64
perf-4.14.173-137.228.amzn2.x86_64
perf-debuginfo-4.14.173-137.228.amzn2.x86_64
python-perf-4.14.173-137.228.amzn2.x86_64
python-perf-debuginfo-4.14.173-137.228.amzn2.x86_64
kernel-tools-4.14.173-137.228.amzn2.x86_64
kernel-tools-devel-4.14.173-137.228.amzn2.x86_64
kernel-tools-debuginfo-4.14.173-137.228.amzn2.x86_64
kernel-devel-4.14.173-137.228.amzn2.x86_64
kernel-debuginfo-4.14.173-137.228.amzn2.x86_64
kernel-livepatch-4.14.173-137.228-1.0-0.amzn2.x86_64