CVE-2021-26930: High severity Linux Linux kernel vulnerability

Published Feb 17, 2021
·
Updated

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.

Affected Software

85 affected componentsFixes available
Linux Linux kernel>=3.11<=5.10.16
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Debian Debian Linux=9.0
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.22-16.12.25-1
ubuntu/linux-aws<4.4.0-1090.94
4.4.0-1090.94
ubuntu/linux-azure<4.15.0-1114.127~14.04.1
4.15.0-1114.127~14.04.1
ubuntu/linux-lts-xenial<4.4.0-208.240~14.04.1
4.4.0-208.240~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-208.240
4.4.0-208.240
ubuntu/linux-aws<4.4.0-1126.140
4.4.0-1126.140
ubuntu/linux-kvm<4.4.0-1091.100
4.4.0-1091.100
ubuntu/linux-raspi2<4.4.0-1150.161
4.4.0-1150.161
ubuntu/linux-snapdragon<4.4.0-1154.164
4.4.0-1154.164
ubuntu/linux-aws-hwe<4.15.0-1102.109~16.04.1
4.15.0-1102.109~16.04.1
ubuntu/linux-azure<4.15.0-1114.127~16.04.1
4.15.0-1114.127~16.04.1
ubuntu/linux-gcp<4.15.0-1099.112~16.04.1
4.15.0-1099.112~16.04.1
ubuntu/linux-hwe<4.15.0-143.147~16.04.3
4.15.0-143.147~16.04.3
ubuntu/linux-oracle<4.15.0-1071.79~16.04.1
4.15.0-1071.79~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1060.66
4.4.0-1060.66
ubuntu/linux-fips*
ubuntu/linux<4.15.0-143.147
4.15.0-143.147
ubuntu/linux-aws<4.15.0-1102.109
4.15.0-1102.109
ubuntu/linux-aws-5.4<5.4.0-1043.45~18.04.1
5.4.0-1043.45~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1114.127
4.15.0-1114.127
ubuntu/linux-azure-5.4<5.4.0-1044.46~18.04.1
5.4.0-1044.46~18.04.1
ubuntu/linux-dell300x<4.15.0-1018.22
4.15.0-1018.22
ubuntu/linux-gcp-4.15<4.15.0-1099.112
4.15.0-1099.112
ubuntu/linux-gcp-5.4<5.4.0-1041.44~18.04.1
5.4.0-1041.44~18.04.1
ubuntu/linux-gke-5.4<5.4.0-1040.42~18.04.1
5.4.0-1040.42~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1013.14~18.04.1
5.4.0-1013.14~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-71.79~18.04.1
5.4.0-71.79~18.04.1
ubuntu/linux-kvm<4.15.0-1091.93
4.15.0-1091.93
ubuntu/linux-oracle<4.15.0-1071.79
4.15.0-1071.79
ubuntu/linux-oracle-5.4<5.4.0-1042.45~18.04.1
5.4.0-1042.45~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1033.36~18.04.1
5.4.0-1033.36~18.04.1
ubuntu/linux-raspi2<4.15.0-1085.90
4.15.0-1085.90
ubuntu/linux-snapdragon<4.15.0-1102.111
4.15.0-1102.111
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-edge*
ubuntu/linux-gke-4.15*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2044.46
4.15.0-2044.46
ubuntu/linux-azure-fips<4.15.0-2026.29
4.15.0-2026.29
ubuntu/linux-fips<4.15.0-1059.67
4.15.0-1059.67
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-71.79
5.4.0-71.79
ubuntu/linux-aws<5.4.0-1043.45
5.4.0-1043.45
ubuntu/linux-azure<5.4.0-1044.46
5.4.0-1044.46
ubuntu/linux-gcp<5.4.0-1041.44
5.4.0-1041.44
ubuntu/linux-gke<5.4.0-1041.43
5.4.0-1041.43
ubuntu/linux-gkeop<5.4.0-1013.14
5.4.0-1013.14
ubuntu/linux-hwe-5.8<5.8.0-53.60~20.04.1
5.8.0-53.60~20.04.1
ubuntu/linux-kvm<5.4.0-1037.38
5.4.0-1037.38
ubuntu/linux-oem-5.10<5.10.0-1017.18
5.10.0-1017.18
ubuntu/linux-oracle<5.4.0-1042.45
5.4.0-1042.45
ubuntu/linux-raspi<5.4.0-1033.36
5.4.0-1033.36
ubuntu/linux-riscv-5.8<5.8.0-25.27~20.04.1
5.8.0-25.27~20.04.1
ubuntu/linux-azure-fde-5.15<5.15.0-1114.123~20.04.1
5.15.0-1114.123~20.04.1
ubuntu/linux-oem-5.6*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-aws-fips<5.4.0-1069.73+fips2
5.4.0-1069.73+fips2
ubuntu/linux-azure-fips<5.4.0-1073.76+fips1
5.4.0-1073.76+fips1
ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1
5.4.0-1067.71~20.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-raspi-realtime*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.22-1Fixed in 6.12.25-1
  2. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1090.94
  3. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1114.127~14.04.1
  4. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-208.240~14.04.1
  5. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-208.240
  6. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1126.140
  7. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1091.100
  8. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1150.161
  9. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1154.164
  10. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1102.109~16.04.1
  11. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1114.127~16.04.1
  12. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1099.112~16.04.1
  13. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-143.147~16.04.3
  14. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1071.79~16.04.1
  15. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1060.66
  16. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-143.147
  17. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1102.109
  18. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1043.45~18.04.1
  19. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1114.127
  20. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1044.46~18.04.1
  21. Upgrade

    Upgrade ubuntu/linux-dell300x to a version that resolves this vulnerability.

    Fixed in 4.15.0-1018.22
  22. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1099.112
  23. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.44~18.04.1
  24. Upgrade

    Upgrade ubuntu/linux-gke-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1040.42~18.04.1
  25. Upgrade

    Upgrade ubuntu/linux-gkeop-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1013.14~18.04.1
  26. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-71.79~18.04.1
  27. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1091.93
  28. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1071.79
  29. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1042.45~18.04.1
  30. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1033.36~18.04.1
  31. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1085.90
  32. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1102.111
  33. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2044.46
  34. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2026.29
  35. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1059.67
  36. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-71.79
  37. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1043.45
  38. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1044.46
  39. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.44
  40. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.43
  41. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0-1013.14
  42. Upgrade

    Upgrade ubuntu/linux-hwe-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-53.60~20.04.1
  43. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1037.38
  44. Upgrade

    Upgrade ubuntu/linux-oem-5.10 to a version that resolves this vulnerability.

    Fixed in 5.10.0-1017.18
  45. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1042.45
  46. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1033.36
  47. Upgrade

    Upgrade ubuntu/linux-riscv-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-25.27~20.04.1
  48. Upgrade

    Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1114.123~20.04.1
  49. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.73+fips2
  50. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1073.76+fips1
  51. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1067.71~20.04.1

Event History

Feb 17, 2021
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Data Sourced
via OSV·01:15 AM
DescriptionSeverityAffected Software

Frequently Asked Questions

1

What are the potential impacts of CVE-2021-26930?

CVE-2021-26930 can lead to denial of service or memory corruption due to mishandling of grant references in the Linux kernel.

2

What is the severity of CVE-2021-26930?

CVE-2021-26930 is classified as a high severity vulnerability due to the risk of system instability.

3

Which versions of the Linux kernel are affected by CVE-2021-26930?

CVE-2021-26930 affects the Linux kernel versions from 3.11 through 5.10.16.

4

How do I fix CVE-2021-26930?

To mitigate CVE-2021-26930, update your Linux kernel to one of the fixed versions such as 5.10.223-1 or higher.

5

Is CVE-2021-26930 specific to any Linux distributions?

CVE-2021-26930 affects multiple distributions including Debian and Fedora, particularly versions using the affected Linux kernel.

Company

Resources

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