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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
32
linux kernel
xen
backends
deliberate crashes
memory allocations

CVSS2

1.9

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

CVSS3

5.5

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

EPSS

0

Percentile

14.2%

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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CVSS2

1.9

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

CVSS3

5.5

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

EPSS

0

Percentile

14.2%

JSON
Related for UB:CVE-2021-26931
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