UBUNTU-CVE-2022-23037: Race Condition

Published Mar 10, 2022
·
Updated

Linux PV device frontends vulnerable to attacks by backends T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Several Linux PV device frontends are using the grant table interfaces for removing access rights of the backends in ways being subject to race conditions, resulting in potential data leaks, data corruption by malicious backends, and denial of service triggered by malicious backends: blkfront, netfront, scsifront and the gntalloc driver are testing whether a grant reference is still in use. If this is not the case, they assume that a following removal of the granted access will always succeed, which is not true in case the backend has mapped the granted page between those two operations. As a result the backend can keep access to the memory page of the guest no matter how the page will be used after the frontend I/O has finished. The xenbus driver has a similar problem, as it doesn't check the success of removing the granted access of a shared ring buffer. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront, and pvcalls are using a functionality to delay freeing a grant reference until it is no longer in use, but the freeing of the related data page is not synchronized with dropping the granted access. As a result the backend can keep access to the memory page even after it has been freed and then re-used for a different purpose. CVE-2022-23041 netfront will fail a BUGON() assertion if it fails to revoke access in the rx path. This will result in a Denial of Service (DoS) situation of the guest which can be triggered by the backend. CVE-2022-23042

Affected Software

103 affected componentsFixes available
ubuntu/linux-azure<4.15.0-1138.151~14.04.1
4.15.0-1138.151~14.04.1
ubuntu/linux*
ubuntu/linux-aws<4.4.0-1162.168
4.4.0-1162.168
ubuntu/linux-lts-xenial<4.4.0-291.325~14.04.1
4.4.0-291.325~14.04.1
ubuntu/linux-aws-hwe<4.15.0-1128.137~16.04.1
4.15.0-1128.137~16.04.1
ubuntu/linux-azure<4.15.0-1138.151~16.04.1
4.15.0-1138.151~16.04.1
ubuntu/linux-gcp<4.15.0-1122.136~16.04.1
4.15.0-1122.136~16.04.1
ubuntu/linux-hwe<4.15.0-177.186~16.04.1
4.15.0-177.186~16.04.1
ubuntu/linux-oracle<4.15.0-1093.102~16.04.1
4.15.0-1093.102~16.04.1
ubuntu/linux<4.4.0-291.325
4.4.0-291.325
ubuntu/linux-aws<4.4.0-1200.215
4.4.0-1200.215
ubuntu/linux-hwe-edge*
ubuntu/linux-kvm<4.4.0-1163.174
4.4.0-1163.174
ubuntu/linux-fips*
ubuntu/linux-fips*
ubuntu/linux<4.15.0-177.186
4.15.0-177.186
ubuntu/linux-aws<4.15.0-1128.137
4.15.0-1128.137
ubuntu/linux-aws-5.4<5.4.0-1078.84~18.04.1
5.4.0-1078.84~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1138.151
4.15.0-1138.151
ubuntu/linux-azure-5.4<5.4.0-1083.87~18.04.1
5.4.0-1083.87~18.04.1
ubuntu/linux-dell300x<4.15.0-1042.47
4.15.0-1042.47
ubuntu/linux-gcp-4.15<4.15.0-1122.136
4.15.0-1122.136
ubuntu/linux-gcp-5.4<5.4.0-1078.84~18.04.1
5.4.0-1078.84~18.04.1
ubuntu/linux-gke-5.4<5.4.0-1074.79~18.04.1
5.4.0-1074.79~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1046.48~18.04.1
5.4.0-1046.48~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-117.132~18.04.1
5.4.0-117.132~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1028.32~18.04.1
5.4.0-1028.32~18.04.1
ubuntu/linux-kvm<4.15.0-1114.117
4.15.0-1114.117
ubuntu/linux-oracle<4.15.0-1093.102
4.15.0-1093.102
ubuntu/linux-oracle-5.4<5.4.0-1076.83~18.04.1
5.4.0-1076.83~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1065.75~18.04.1
5.4.0-1065.75~18.04.1
ubuntu/linux-raspi2<4.15.0-1109.116
4.15.0-1109.116
ubuntu/linux-snapdragon<4.15.0-1127.136
4.15.0-1127.136
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-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<4.15.0-2067.70
4.15.0-2067.70
ubuntu/linux-azure-fips<4.15.0-2049.53
4.15.0-2049.53
ubuntu/linux-fips<4.15.0-1085.94
4.15.0-1085.94
ubuntu/linux-gcp-fips<4.15.0-2032.35
4.15.0-2032.35
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-117.132
5.4.0-117.132
ubuntu/linux-aws<5.4.0-1078.84
5.4.0-1078.84
ubuntu/linux-azure<5.4.0-1083.87
5.4.0-1083.87
ubuntu/linux-bluefield<5.4.0-1040.44
5.4.0-1040.44
ubuntu/linux-gcp<5.4.0-1078.84
5.4.0-1078.84
ubuntu/linux-gke<5.4.0-1074.79
5.4.0-1074.79
ubuntu/linux-gkeop<5.4.0-1046.48
5.4.0-1046.48
ubuntu/linux-ibm<5.4.0-1026.29
5.4.0-1026.29
ubuntu/linux-intel-iotg-5.15<5.15.0-1008.11~20.04.1
5.15.0-1008.11~20.04.1
ubuntu/linux-iot<5.4.0-1004.6
5.4.0-1004.6
ubuntu/linux-kvm<5.4.0-1068.72
5.4.0-1068.72
ubuntu/linux-oracle<5.4.0-1076.83
5.4.0-1076.83
ubuntu/linux-raspi<5.4.0-1065.75
5.4.0-1065.75
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1078.84+fips1
5.4.0-1078.84+fips1
ubuntu/linux-azure-fips<5.4.0-1083.87+fips1
5.4.0-1083.87+fips1
ubuntu/linux-fips<5.4.0-1054.61
5.4.0-1054.61
ubuntu/linux-gcp-fips<5.4.0-1078.84+fips1
5.4.0-1078.84+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-realtime<5.15.0-1007.7
5.15.0-1007.7
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.15.0-1138.151~14.04.1
  2. Upgrade

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

    Fixed in 4.4.0-1162.168
  3. Upgrade

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

    Fixed in 4.4.0-291.325~14.04.1
  4. Upgrade

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

    Fixed in 4.15.0-1128.137~16.04.1
  5. Upgrade

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

    Fixed in 4.15.0-1138.151~16.04.1
  6. Upgrade

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

    Fixed in 4.15.0-1122.136~16.04.1
  7. Upgrade

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

    Fixed in 4.15.0-177.186~16.04.1
  8. Upgrade

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

    Fixed in 4.15.0-1093.102~16.04.1
  9. Upgrade

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

    Fixed in 4.4.0-291.325
  10. Upgrade

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

    Fixed in 4.4.0-1200.215
  11. Upgrade

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

    Fixed in 4.4.0-1163.174
  12. Upgrade

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

    Fixed in 4.15.0-177.186
  13. Upgrade

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

    Fixed in 4.15.0-1128.137
  14. Upgrade

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

    Fixed in 5.4.0-1078.84~18.04.1
  15. Upgrade

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

    Fixed in 4.15.0-1138.151
  16. Upgrade

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

    Fixed in 5.4.0-1083.87~18.04.1
  17. Upgrade

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

    Fixed in 4.15.0-1042.47
  18. Upgrade

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

    Fixed in 4.15.0-1122.136
  19. Upgrade

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

    Fixed in 5.4.0-1078.84~18.04.1
  20. Upgrade

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

    Fixed in 5.4.0-1074.79~18.04.1
  21. Upgrade

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

    Fixed in 5.4.0-1046.48~18.04.1
  22. Upgrade

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

    Fixed in 5.4.0-117.132~18.04.1
  23. Upgrade

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

    Fixed in 5.4.0-1028.32~18.04.1
  24. Upgrade

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

    Fixed in 4.15.0-1114.117
  25. Upgrade

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

    Fixed in 4.15.0-1093.102
  26. Upgrade

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

    Fixed in 5.4.0-1076.83~18.04.1
  27. Upgrade

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

    Fixed in 5.4.0-1065.75~18.04.1
  28. Upgrade

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

    Fixed in 4.15.0-1109.116
  29. Upgrade

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

    Fixed in 4.15.0-1127.136
  30. Upgrade

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

    Fixed in 4.15.0-2067.70
  31. Upgrade

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

    Fixed in 4.15.0-2049.53
  32. Upgrade

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

    Fixed in 4.15.0-1085.94
  33. Upgrade

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

    Fixed in 4.15.0-2032.35
  34. Upgrade

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

    Fixed in 5.4.0-117.132
  35. Upgrade

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

    Fixed in 5.4.0-1078.84
  36. Upgrade

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

    Fixed in 5.4.0-1083.87
  37. Upgrade

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

    Fixed in 5.4.0-1040.44
  38. Upgrade

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

    Fixed in 5.4.0-1078.84
  39. Upgrade

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

    Fixed in 5.4.0-1074.79
  40. Upgrade

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

    Fixed in 5.4.0-1046.48
  41. Upgrade

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

    Fixed in 5.4.0-1026.29
  42. Upgrade

    Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1008.11~20.04.1
  43. Upgrade

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

    Fixed in 5.4.0-1004.6
  44. Upgrade

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

    Fixed in 5.4.0-1068.72
  45. Upgrade

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

    Fixed in 5.4.0-1076.83
  46. Upgrade

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

    Fixed in 5.4.0-1065.75
  47. Upgrade

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

    Fixed in 5.4.0-1078.84+fips1
  48. Upgrade

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

    Fixed in 5.4.0-1083.87+fips1
  49. Upgrade

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

    Fixed in 5.4.0-1054.61
  50. Upgrade

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

    Fixed in 5.4.0-1078.84+fips1
  51. Upgrade

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

    Fixed in 5.15.0-1007.7

Event History

Mar 10, 2022
CVE Published
via OSV·08:15 PM
Data Sourced
via OSV·08:15 PM
DescriptionSeverityAffected Software

Frequently Asked Questions

1

Which systems are exposed to this issue?

Systems using the Linux Xen PV netfront driver are exposed when their network backend is malicious. The listed Ubuntu kernel packages include linux, linux-aws, linux-azure, linux-gcp, and their FIPS variants.

2

What does an attacker need to exploit it?

An attacker needs control of, or the ability to act as, the Xen network backend. They must map a granted page in the race window between the frontend checking whether a grant reference is in use and attempting to remove backend access.

3

What could successful exploitation allow?

A malicious backend may retain access to guest memory after frontend I/O has completed. This can result in data disclosure, data corruption, or denial of service.

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