Amazon Linux 2 Security Advisory: ALAS-2020-1440
Advisory Release Date: 2020-06-16 18:21 Pacific
Advisory Updated Date: 2020-06-17 23:37 Pacific
A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat. (CVE-2020-12826)
An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body. (CVE-2020-12657)
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.
aarch64:
kernel-4.14.177-139.253.amzn2.aarch64
kernel-headers-4.14.177-139.253.amzn2.aarch64
kernel-debuginfo-common-aarch64-4.14.177-139.253.amzn2.aarch64
perf-4.14.177-139.253.amzn2.aarch64
perf-debuginfo-4.14.177-139.253.amzn2.aarch64
python-perf-4.14.177-139.253.amzn2.aarch64
python-perf-debuginfo-4.14.177-139.253.amzn2.aarch64
kernel-tools-4.14.177-139.253.amzn2.aarch64
kernel-tools-devel-4.14.177-139.253.amzn2.aarch64
kernel-tools-debuginfo-4.14.177-139.253.amzn2.aarch64
kernel-devel-4.14.177-139.253.amzn2.aarch64
kernel-debuginfo-4.14.177-139.253.amzn2.aarch64
i686:
kernel-headers-4.14.177-139.253.amzn2.i686
src:
kernel-4.14.177-139.253.amzn2.src
x86_64:
kernel-4.14.177-139.253.amzn2.x86_64
kernel-headers-4.14.177-139.253.amzn2.x86_64
kernel-debuginfo-common-x86_64-4.14.177-139.253.amzn2.x86_64
perf-4.14.177-139.253.amzn2.x86_64
perf-debuginfo-4.14.177-139.253.amzn2.x86_64
python-perf-4.14.177-139.253.amzn2.x86_64
python-perf-debuginfo-4.14.177-139.253.amzn2.x86_64
kernel-tools-4.14.177-139.253.amzn2.x86_64
kernel-tools-devel-4.14.177-139.253.amzn2.x86_64
kernel-tools-debuginfo-4.14.177-139.253.amzn2.x86_64
kernel-devel-4.14.177-139.253.amzn2.x86_64
kernel-debuginfo-4.14.177-139.253.amzn2.x86_64
kernel-livepatch-4.14.177-139.253-1.0-0.amzn2.x86_64