4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.9 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
20.6%
Issue Overview:
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.
New Packages:
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
Red Hat: CVE-2020-12657, CVE-2020-12826
Mitre: CVE-2020-12657, CVE-2020-12826
4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.9 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
20.6%