Amazon Linux 2 Security Advisory: ALAS-2018-1051
Advisory Release Date: 2018-08-04 23:49 Pacific
Advisory Updated Date: 2018-08-06 18:37 Pacific
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.
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