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amazonAmazonALAS2-2020-1440
HistoryJun 16, 2020 - 6:21 p.m.

Important: kernel

2020-06-1618:21:00
alas.aws.amazon.com
44

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access 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

0.001 Low

EPSS

Percentile

18.9%

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  

Additional References

Red Hat: CVE-2020-12657, CVE-2020-12826

Mitre: CVE-2020-12657, CVE-2020-12826

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access 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

0.001 Low

EPSS

Percentile

18.9%