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amazonAmazonALAS-2016-757
HistoryOct 20, 2016 - 4:11 a.m.

Critical: kernel

2016-10-2004:11:00
alas.aws.amazon.com
31

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

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.879 High

EPSS

Percentile

98.6%

JSON

Issue Overview:

A race condition was found in the way the Linux kernel’s memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system.

(Updated 2016-11-10: This advisory was upgraded to Critical.)

Affected Packages:

kernel

Issue Correction:
Run yum update kernel to update your system. You will need to reboot your system in order for the new kernel to be running.

New Packages:

i686:  
    kernel-4.4.23-31.54.amzn1.i686  
    kernel-devel-4.4.23-31.54.amzn1.i686  
    kernel-tools-debuginfo-4.4.23-31.54.amzn1.i686  
    kernel-tools-devel-4.4.23-31.54.amzn1.i686  
    kernel-debuginfo-common-i686-4.4.23-31.54.amzn1.i686  
    perf-4.4.23-31.54.amzn1.i686  
    kernel-debuginfo-4.4.23-31.54.amzn1.i686  
    perf-debuginfo-4.4.23-31.54.amzn1.i686  
    kernel-tools-4.4.23-31.54.amzn1.i686  
    kernel-headers-4.4.23-31.54.amzn1.i686  
  
noarch:  
    kernel-doc-4.4.23-31.54.amzn1.noarch  
  
src:  
    kernel-4.4.23-31.54.amzn1.src  
  
x86_64:  
    kernel-tools-devel-4.4.23-31.54.amzn1.x86_64  
    kernel-4.4.23-31.54.amzn1.x86_64  
    kernel-tools-debuginfo-4.4.23-31.54.amzn1.x86_64  
    perf-debuginfo-4.4.23-31.54.amzn1.x86_64  
    kernel-devel-4.4.23-31.54.amzn1.x86_64  
    kernel-tools-4.4.23-31.54.amzn1.x86_64  
    perf-4.4.23-31.54.amzn1.x86_64  
    kernel-debuginfo-4.4.23-31.54.amzn1.x86_64  
    kernel-headers-4.4.23-31.54.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-4.4.23-31.54.amzn1.x86_64

Additional References

Red Hat: CVE-2016-5195

Mitre: CVE-2016-5195

OSVersionArchitecturePackageVersionFilename
Amazon Linux1i686kernel< 4.4.23-31.54.amzn1kernel-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-devel< 4.4.23-31.54.amzn1kernel-devel-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-tools-debuginfo< 4.4.23-31.54.amzn1kernel-tools-debuginfo-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-tools-devel< 4.4.23-31.54.amzn1kernel-tools-devel-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-debuginfo-common-i686< 4.4.23-31.54.amzn1kernel-debuginfo-common-i686-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686perf< 4.4.23-31.54.amzn1perf-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-debuginfo< 4.4.23-31.54.amzn1kernel-debuginfo-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686perf-debuginfo< 4.4.23-31.54.amzn1perf-debuginfo-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-tools< 4.4.23-31.54.amzn1kernel-tools-4.4.23-31.54.amzn1.i686.rpm
Amazon Linux1i686kernel-headers< 4.4.23-31.54.amzn1kernel-headers-4.4.23-31.54.amzn1.i686.rpm
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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

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.879 High

EPSS

Percentile

98.6%

JSON
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