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Ubuntu.comUB:CVE-2021-39634

HistoryJan 14, 2022 - 12:00 a.m.

CVE-2021-39634

2022-01-1400:00:00

ubuntu.com

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

0.0004 Low

EPSS

Percentile

5.3%

JSON

In fs/eventpoll.c, there is a possible use after free. This could lead to
local escalation of privilege with no additional execution privileges
needed. User interaction is not needed for exploitation.Product:
AndroidVersions: Android kernelAndroid ID: A-204450605References: Upstream
kernel

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-126.129UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-56.62UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-197.229) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1088.93UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1030.31UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1082.86) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1118.132) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1030.31~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1088.93~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1032.33UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-126.129	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-56.62	UNKNOWN
ubuntu	16.04	noarch	linux	< 4.4.0-197.229) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1088.93	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1030.31	UNKNOWN
ubuntu	14.04	noarch	linux-aws	< 4.4.0-1082.86) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	linux-aws	< 4.4.0-1118.132) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1030.31~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1088.93~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1032.33	UNKNOWN

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References

git.kernel.org/linus/f8d4f44df056c5b504b0d49683fb7279218fd207 (5.9-rc8)

launchpad.net/bugs/cve/CVE-2021-39634

nvd.nist.gov/vuln/detail/CVE-2021-39634

security-tracker.debian.org/tracker/CVE-2021-39634

source.android.com/security/bulletin/2022-01-01

www.cve.org/CVERecord?id=CVE-2021-39634

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

0.0004 Low

EPSS

Percentile

5.3%

JSON

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