Medium: kernel

Issue Overview:

A flaw was found in kernel/bpf/verifier.c in BPF in the Linux kernel. An incorrect limit is enforced for pointer arithmetic operations which can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-33200)

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-4.14.232-177.418.amzn2.aarch64  
    kernel-headers-4.14.232-177.418.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.232-177.418.amzn2.aarch64  
    perf-4.14.232-177.418.amzn2.aarch64  
    perf-debuginfo-4.14.232-177.418.amzn2.aarch64  
    python-perf-4.14.232-177.418.amzn2.aarch64  
    python-perf-debuginfo-4.14.232-177.418.amzn2.aarch64  
    kernel-tools-4.14.232-177.418.amzn2.aarch64  
    kernel-tools-devel-4.14.232-177.418.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.232-177.418.amzn2.aarch64  
    kernel-devel-4.14.232-177.418.amzn2.aarch64  
    kernel-debuginfo-4.14.232-177.418.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.232-177.418.amzn2.i686  
  
src:  
    kernel-4.14.232-177.418.amzn2.src  
  
x86_64:  
    kernel-4.14.232-177.418.amzn2.x86_64  
    kernel-headers-4.14.232-177.418.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.232-177.418.amzn2.x86_64  
    perf-4.14.232-177.418.amzn2.x86_64  
    perf-debuginfo-4.14.232-177.418.amzn2.x86_64  
    python-perf-4.14.232-177.418.amzn2.x86_64  
    python-perf-debuginfo-4.14.232-177.418.amzn2.x86_64  
    kernel-tools-4.14.232-177.418.amzn2.x86_64  
    kernel-tools-devel-4.14.232-177.418.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.232-177.418.amzn2.x86_64  
    kernel-devel-4.14.232-177.418.amzn2.x86_64  
    kernel-debuginfo-4.14.232-177.418.amzn2.x86_64  
    kernel-livepatch-4.14.232-177.418-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2021-33200

Mitre: CVE-2021-33200