Important: kernel

Issue Overview:

A use-after-free vulnerability in the Linux kernel’s netfilter: nf_tables component can be exploited to achieve local privilege escalation.

The nft_verdict_init() function allows positive values as drop error within the hook verdict, and hence the nf_hook_slow() function can cause a double free vulnerability when NF_DROP is issued with a drop error which resembles NF_ACCEPT.

We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660. (CVE-2024-1086)

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-4.14.336-256.559.amzn2.aarch64  
    kernel-headers-4.14.336-256.559.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.336-256.559.amzn2.aarch64  
    perf-4.14.336-256.559.amzn2.aarch64  
    perf-debuginfo-4.14.336-256.559.amzn2.aarch64  
    python-perf-4.14.336-256.559.amzn2.aarch64  
    python-perf-debuginfo-4.14.336-256.559.amzn2.aarch64  
    kernel-tools-4.14.336-256.559.amzn2.aarch64  
    kernel-tools-devel-4.14.336-256.559.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.336-256.559.amzn2.aarch64  
    kernel-devel-4.14.336-256.559.amzn2.aarch64  
    kernel-debuginfo-4.14.336-256.559.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.336-256.559.amzn2.i686  
  
src:  
    kernel-4.14.336-256.559.amzn2.src  
  
x86_64:  
    kernel-4.14.336-256.559.amzn2.x86_64  
    kernel-headers-4.14.336-256.559.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.336-256.559.amzn2.x86_64  
    perf-4.14.336-256.559.amzn2.x86_64  
    perf-debuginfo-4.14.336-256.559.amzn2.x86_64  
    python-perf-4.14.336-256.559.amzn2.x86_64  
    python-perf-debuginfo-4.14.336-256.559.amzn2.x86_64  
    kernel-tools-4.14.336-256.559.amzn2.x86_64  
    kernel-tools-devel-4.14.336-256.559.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.336-256.559.amzn2.x86_64  
    kernel-devel-4.14.336-256.559.amzn2.x86_64  
    kernel-debuginfo-4.14.336-256.559.amzn2.x86_64  
    kernel-livepatch-4.14.336-256.559-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2024-1086

Mitre: CVE-2024-1086