CVE-2021-28038

2021-03-0500:00:00

ubuntu.com

6.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.0004 Low

EPSS

Percentile

13.3%

JSON

An issue was discovered in the Linux kernel through 5.11.3, as used with
Xen PV. A certain part of the netback driver lacks necessary treatment of
errors such as failed memory allocations (as a result of changes to the
handling of grant mapping errors). A host OS denial of service may occur
during misbehavior of a networking frontend driver. NOTE: this issue exists
because of an incomplete fix for CVE-2021-26931.

Notes

Author	Note
sbeattie	kernels where the fix for CVE-2021-26931 had not landed yet are not affected by this issue.

OSVersionArchitecturePackageVersionFilename
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1102.109~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu14.04noarchlinux-azure< 4.15.0-1114.127~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.10noarchlinux-azure< 5.8.0-1033.35UNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1047.49UNKNOWN
ubuntu18.04noarchlinux-azure-4.15< 4.15.0-1114.127UNKNOWN
ubuntu18.04noarchlinux-azure-5.4< 5.4.0-1047.49~18.04.1UNKNOWN
ubuntu22.04noarchlinux-azure-fde< anyUNKNOWN
ubuntu20.04noarchlinux-azure-fde< 5.4.0-1047.49UNKNOWN
ubuntu20.04noarchlinux-bluefield< 5.4.0-1011.14UNKNOWN
ubuntu18.04noarchlinux-dell300x< 4.15.0-1018.22UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1102.109~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	14.04	noarch	linux-azure	< 4.15.0-1114.127~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	20.10	noarch	linux-azure	< 5.8.0-1033.35	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1047.49	UNKNOWN
ubuntu	18.04	noarch	linux-azure-4.15	< 4.15.0-1114.127	UNKNOWN
ubuntu	18.04	noarch	linux-azure-5.4	< 5.4.0-1047.49~18.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-azure-fde	< any	UNKNOWN
ubuntu	20.04	noarch	linux-azure-fde	< 5.4.0-1047.49	UNKNOWN
ubuntu	20.04	noarch	linux-bluefield	< 5.4.0-1011.14	UNKNOWN
ubuntu	18.04	noarch	linux-dell300x	< 4.15.0-1018.22	UNKNOWN