ALAS2-2018-1133

Amazon Linux 2 Security Advisory: ALAS-2018-1133
Advisory Release Date: 2018-12-17 19:37 Pacific
Advisory Updated Date: 2018-12-19 17:44 Pacific
Severity: Medium
Issue Overview:

A security flaw was found in the Linux kernel in a way that the cleancache subsystem clears an inode after the final file truncation (removal). The new file created with the same inode may contain leftover pages from cleancache and the old file data instead of the new one.(CVE-2018-16862)

An issue was discovered in the Linux kernel through 4.19. An information leak in cdrom_ioctl_select_disc in drivers/cdrom/cdrom.c could be used by local attackers to read kernel memory because a cast from unsigned long to int interferes with bounds checking.(CVE-2018-18710)

A NULL pointer dereference security flaw was found in the Linux kernel in the vcpu_scan_ioapic() function in arch/x86/kvm/x86.c. This allows local users with certain privileges to cause a denial of service via a crafted system call to the KVM subsystem.(CVE-2018-19407)


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-4.14.88-88.73.amzn2.aarch64
    kernel-headers-4.14.88-88.73.amzn2.aarch64
    kernel-debuginfo-common-aarch64-4.14.88-88.73.amzn2.aarch64
    perf-4.14.88-88.73.amzn2.aarch64
    perf-debuginfo-4.14.88-88.73.amzn2.aarch64
    python-perf-4.14.88-88.73.amzn2.aarch64
    python-perf-debuginfo-4.14.88-88.73.amzn2.aarch64
    kernel-tools-4.14.88-88.73.amzn2.aarch64
    kernel-tools-devel-4.14.88-88.73.amzn2.aarch64
    kernel-tools-debuginfo-4.14.88-88.73.amzn2.aarch64
    kernel-devel-4.14.88-88.73.amzn2.aarch64
    kernel-debuginfo-4.14.88-88.73.amzn2.aarch64

i686:
    kernel-headers-4.14.88-88.73.amzn2.i686

src:
    kernel-4.14.88-88.73.amzn2.src

x86_64:
    kernel-4.14.88-88.73.amzn2.x86_64
    kernel-headers-4.14.88-88.73.amzn2.x86_64
    kernel-debuginfo-common-x86_64-4.14.88-88.73.amzn2.x86_64
    perf-4.14.88-88.73.amzn2.x86_64
    perf-debuginfo-4.14.88-88.73.amzn2.x86_64
    python-perf-4.14.88-88.73.amzn2.x86_64
    python-perf-debuginfo-4.14.88-88.73.amzn2.x86_64
    kernel-tools-4.14.88-88.73.amzn2.x86_64
    kernel-tools-devel-4.14.88-88.73.amzn2.x86_64
    kernel-tools-debuginfo-4.14.88-88.73.amzn2.x86_64
    kernel-devel-4.14.88-88.73.amzn2.x86_64
    kernel-debuginfo-4.14.88-88.73.amzn2.x86_64

Additional References

Red Hat: CVE-2018-16862, CVE-2018-18710, CVE-2018-19407

Mitre: CVE-2018-16862, CVE-2018-18710, CVE-2018-19407