Amazon Linux 2 Security Advisory: ALAS-2021-1699
Advisory Release Date: 2021-08-13 17:31 Pacific
Advisory Updated Date: 2021-08-16 18:01 Pacific
Severity:
Important
Issue Overview:
A flaw was found in the Linux kernel's KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability. (CVE-2021-22543)
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.
New Packages:
aarch64:
kernel-4.14.243-185.433.amzn2.aarch64
kernel-headers-4.14.243-185.433.amzn2.aarch64
kernel-debuginfo-common-aarch64-4.14.243-185.433.amzn2.aarch64
perf-4.14.243-185.433.amzn2.aarch64
perf-debuginfo-4.14.243-185.433.amzn2.aarch64
python-perf-4.14.243-185.433.amzn2.aarch64
python-perf-debuginfo-4.14.243-185.433.amzn2.aarch64
kernel-tools-4.14.243-185.433.amzn2.aarch64
kernel-tools-devel-4.14.243-185.433.amzn2.aarch64
kernel-tools-debuginfo-4.14.243-185.433.amzn2.aarch64
kernel-devel-4.14.243-185.433.amzn2.aarch64
kernel-debuginfo-4.14.243-185.433.amzn2.aarch64
i686:
kernel-headers-4.14.243-185.433.amzn2.i686
src:
kernel-4.14.243-185.433.amzn2.src
x86_64:
kernel-4.14.243-185.433.amzn2.x86_64
kernel-headers-4.14.243-185.433.amzn2.x86_64
kernel-debuginfo-common-x86_64-4.14.243-185.433.amzn2.x86_64
perf-4.14.243-185.433.amzn2.x86_64
perf-debuginfo-4.14.243-185.433.amzn2.x86_64
python-perf-4.14.243-185.433.amzn2.x86_64
python-perf-debuginfo-4.14.243-185.433.amzn2.x86_64
kernel-tools-4.14.243-185.433.amzn2.x86_64
kernel-tools-devel-4.14.243-185.433.amzn2.x86_64
kernel-tools-debuginfo-4.14.243-185.433.amzn2.x86_64
kernel-devel-4.14.243-185.433.amzn2.x86_64
kernel-debuginfo-4.14.243-185.433.amzn2.x86_64
kernel-livepatch-4.14.243-185.433-1.0-0.amzn2.x86_64