UBUNTU-CVE-2021-26930

Advisory lineage Upstream: 1 Downstream: 4
Upstream
CVE-2021-26930
Published: 17 Feb 2021, 01:15
Last modified:03 Jun 2026, 13:34

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Feb 2021, 01:15
Published
Vulnerability first disclosed
03 Jun 2026, 13:34
Last Modified
Vulnerability information updated

Description

An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • 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

    all

  • 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-nvidia

    all

  • 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 (8)