Low: kernel

Issue Overview:

An issue was discovered in the XFS filesystem in fs/xfs/libxfs/xfs_attr_leaf.c in the Linux kernel. A NULL pointer dereference may occur for a corrupted xfs image after xfs_da_shrink_inode() is called with a NULL bp. This can lead to a system crash and a denial of service.(CVE-2018-13094)

An issue was discovered in the XFS filesystem in fs/xfs/xfs_icache.c in the Linux kernel. There is a NULL pointer dereference leading to a system panic in lookup_slow() on a NULL inode->i_ops pointer when doing pathwalks on a corrupted xfs image. This occurs because of a lack of proper validation that cached inodes are free during an allocation.(CVE-2018-13093)

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 and reboot your instance to update your system.

New Packages:

src:  
    kernel-4.14.59-68.43.amzn2.src  
  
x86_64:  
    kernel-4.14.59-68.43.amzn2.x86_64  
    kernel-headers-4.14.59-68.43.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.59-68.43.amzn2.x86_64  
    perf-4.14.59-68.43.amzn2.x86_64  
    perf-debuginfo-4.14.59-68.43.amzn2.x86_64  
    python-perf-4.14.59-68.43.amzn2.x86_64  
    python-perf-debuginfo-4.14.59-68.43.amzn2.x86_64  
    kernel-tools-4.14.59-68.43.amzn2.x86_64  
    kernel-tools-devel-4.14.59-68.43.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.59-68.43.amzn2.x86_64  
    kernel-devel-4.14.59-68.43.amzn2.x86_64  
    kernel-debuginfo-4.14.59-68.43.amzn2.x86_64  

Additional References

Red Hat: CVE-2018-13093, CVE-2018-13094

Mitre: CVE-2018-13093, CVE-2018-13094