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ubuntucveUbuntu.comUB:CVE-2021-26931
HistoryFeb 17, 2021 - 12:00 a.m.

CVE-2021-26931

2021-02-1700:00:00
ubuntu.com
ubuntu.com
27

1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

14.3%

JSON

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used
in Xen. Block, net, and SCSI backends consider certain errors a plain bug,
deliberately causing a kernel crash. For errors potentially being at least
under the influence of guests (such as out of memory conditions), it isn’t
correct to assume a plain bug. Memory allocations potentially causing such
crashes occur only when Linux is running in PV mode, though. This affects
drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-143.147UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-71.79UNKNOWN
ubuntu20.10noarchlinux< 5.8.0-53.60UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-207.239UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1102.109UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1043.45UNKNOWN
ubuntu20.10noarchlinux-aws< 5.8.0-1033.35UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1090.94UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1126.140UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1043.45~18.04.1UNKNOWN
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1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

14.3%

JSON
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