CVE-2021-26931

Aliases:UBUNTU-CVE-2021-26931DEBIAN-CVE-2021-26931
Advisory lineage Upstream: 0 Downstream: 27
Modified
Published: 17 Feb 2021, 00:00
Last modified:03 Aug 2024, 20:33

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.56% LOW
1% probability +0.49%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Feb 2021, 00:00
Published
Vulnerability first disclosed
03 Aug 2024, 20:33
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • v2.0•LOW•Score: 1.9AV:L/AC:M/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.56%• Percentile: 45%

Techniques & Countermeasures

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • debian•linux

    < 5.10.19-1 | < 5.10.19-1 | < 5.10.19-1 | < 5.10.19-1

  • ubuntu•linux

    all | < 4.4.0-208.240 | < 4.15.0-143.147 | < 5.4.0-71.79

  • ubuntu•linux-aws

    < 4.4.0-1090.94 | < 4.4.0-1126.140 | < 4.15.0-1102.109 | < 5.4.0-1043.45

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1043.45~18.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2044.46 | all | < 5.4.0-1069.73+fips2

  • ubuntu•linux-aws-hwe

    < 4.15.0-1102.109~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1114.127~14.04.1 | < 4.15.0-1114.127~16.04.1 | all | < 5.4.0-1044.46

  • ubuntu•linux-azure-4.15

    < 4.15.0-1114.127

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1044.46~18.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde-5.15

    < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-fips

    < 4.15.0-2026.29 | all | < 5.4.0-1073.76+fips1

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-dell300x

    < 4.15.0-1018.22

  • ubuntu•linux-fips

    < 4.4.0-1060.66 | all | < 4.15.0-1059.67

  • ubuntu•linux-gcp

    < 4.15.0-1099.112~16.04.1 | all | < 5.4.0-1041.44

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1099.112

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1041.44~18.04.1

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all | < 5.4.0-1067.71~20.04.1

  • ubuntu•linux-gke

    < 5.4.0-1041.43

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    < 5.4.0-1040.42~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1013.14

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1013.14~18.04.1

  • ubuntu•linux-hwe

    < 4.15.0-143.147~16.04.3 | all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-71.79~18.04.1

  • ubuntu•linux-hwe-5.8

    < 5.8.0-53.60~20.04.1

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1091.100 | < 4.15.0-1091.93 | < 5.4.0-1037.38

  • ubuntu•linux-lts-xenial

    < 4.4.0-208.240~14.04.1

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.10

    < 5.10.0-1017.18

  • ubuntu•linux-oem-5.6

    all

  • ubuntu•linux-oracle

    < 4.15.0-1071.79~16.04.1 | < 4.15.0-1071.79 | < 5.4.0-1042.45

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1042.45~18.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1033.36

  • ubuntu•linux-raspi-5.4

    < 5.4.0-1033.36~18.04.1

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1150.161 | < 4.15.0-1085.90 | all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all

  • ubuntu•linux-riscv-5.8

    < 5.8.0-25.27~20.04.1

Showing first 50 affected entries in server-rendered view.

References (18)