Amazon Linux 2 Security Advisory: ALASKERNEL-5.4-2022-009
Advisory Release Date: 2022-01-20 19:10 Pacific
Advisory Updated Date: 2022-04-05 21:50 Pacific
FAQs regarding Amazon Linux ALAS/CVE Severity
A flaw was found in the Linux kernel. A memory leak in the ccp-ops crypto driver can allow attackers to cause a denial of service. This vulnerability is similar with the older CVE-2019-18808. The highest threat from this vulnerability is to system availability. (CVE-2021-3744)
A memory leak flaw was found in the Linux kernel's ccp_run_aes_gcm_cmd() function that allows an attacker to cause a denial of service. The vulnerability is similar to the older CVE-2019-18808. The highest threat from this vulnerability is to system availability. (CVE-2021-3764)
An out-of-bounds (OOB) memory write flaw was found in prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the bpf in the Linux kernel. In this flaw, the multiplication to calculate the size could lead to an integer overflow which could allow a local attacker, with a special user privilege, to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. (CVE-2021-41864)
A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well. (CVE-2021-20322)
References to CVE-2021-20322 have been added after the original release of this advisory, however those vulnerabilities were fixed by the packages referenced by this advisory's initial release on 2022-01-20.
Affected Packages:
kernel
Note:
This advisory is applicable to Amazon Linux 2 - Kernel-5.4 Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and 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-5.4.156-83.273.amzn2.aarch64
kernel-headers-5.4.156-83.273.amzn2.aarch64
kernel-debuginfo-common-aarch64-5.4.156-83.273.amzn2.aarch64
perf-5.4.156-83.273.amzn2.aarch64
perf-debuginfo-5.4.156-83.273.amzn2.aarch64
python-perf-5.4.156-83.273.amzn2.aarch64
python-perf-debuginfo-5.4.156-83.273.amzn2.aarch64
kernel-tools-5.4.156-83.273.amzn2.aarch64
kernel-tools-devel-5.4.156-83.273.amzn2.aarch64
kernel-tools-debuginfo-5.4.156-83.273.amzn2.aarch64
bpftool-5.4.156-83.273.amzn2.aarch64
bpftool-debuginfo-5.4.156-83.273.amzn2.aarch64
kernel-devel-5.4.156-83.273.amzn2.aarch64
kernel-debuginfo-5.4.156-83.273.amzn2.aarch64
i686:
kernel-headers-5.4.156-83.273.amzn2.i686
src:
kernel-5.4.156-83.273.amzn2.src
x86_64:
kernel-5.4.156-83.273.amzn2.x86_64
kernel-headers-5.4.156-83.273.amzn2.x86_64
kernel-debuginfo-common-x86_64-5.4.156-83.273.amzn2.x86_64
perf-5.4.156-83.273.amzn2.x86_64
perf-debuginfo-5.4.156-83.273.amzn2.x86_64
python-perf-5.4.156-83.273.amzn2.x86_64
python-perf-debuginfo-5.4.156-83.273.amzn2.x86_64
kernel-tools-5.4.156-83.273.amzn2.x86_64
kernel-tools-devel-5.4.156-83.273.amzn2.x86_64
kernel-tools-debuginfo-5.4.156-83.273.amzn2.x86_64
bpftool-5.4.156-83.273.amzn2.x86_64
bpftool-debuginfo-5.4.156-83.273.amzn2.x86_64
kernel-devel-5.4.156-83.273.amzn2.x86_64
kernel-debuginfo-5.4.156-83.273.amzn2.x86_64