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Ubuntu.comUB:CVE-2021-39656

HistoryDec 15, 2021 - 12:00 a.m.

CVE-2021-39656

2021-12-1500:00:00

ubuntu.com

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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

0.0004 Low

EPSS

Percentile

5.3%

JSON

In __configfs_open_file of file.c, there is a possible use-after-free due
to improper locking. This could lead to local escalation of privilege in
the kernel with System execution privileges needed. User interaction is not
needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
A-174049066References: Upstream kernel

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-144.148UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-73.82UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1103.110UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1048.50UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1048.50~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1103.110~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1047.49UNKNOWN
ubuntu14.04noarchlinux-azure< 4.15.0-1115.128~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchlinux-azure< 4.15.0-1115.128~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchlinux-azure-4.15< 4.15.0-1115.128UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-144.148	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-73.82	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1103.110	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1048.50	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1048.50~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1103.110~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1047.49	UNKNOWN
ubuntu	14.04	noarch	linux-azure	< 4.15.0-1115.128~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	linux-azure	< 4.15.0-1115.128~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	18.04	noarch	linux-azure-4.15	< 4.15.0-1115.128	UNKNOWN

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References

git.kernel.org/linus/14fbbc8297728e880070f7b077b3301a8c698ef9 (5.12-rc3)

launchpad.net/bugs/cve/CVE-2021-39656

nvd.nist.gov/vuln/detail/CVE-2021-39656

security-tracker.debian.org/tracker/CVE-2021-39656

source.android.com/security/bulletin/pixel/2021-12-01

www.cve.org/CVERecord?id=CVE-2021-39656

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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

0.0004 Low

EPSS

Percentile

5.3%

JSON

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