CVE-2022-48733: btrfs: fix use-after-free after failure to create a snapshot

Published Jun 20, 2024
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix use-after-free after failure to create a snapshot

At ioctl.c:createsnapshot(), we allocate a pending snapshot structure and then attach it to the transaction's list of pending snapshots. After that we call btrfscommittransaction(), and if that returns an error we jump to 'fail' label, where we kfree() the pending snapshot structure. This can result in a later use-after-free of the pending snapshot:

1) We allocated the pending snapshot and added it to the transaction's list of pending snapshots;

2) We call btrfscommittransaction(), and it fails either at the first call to btrfsrundelayedrefs() or btrfsstartdirtyblockgroups(). In both cases, we don't abort the transaction and we release our transaction handle. We jump to the 'fail' label and free the pending snapshot structure. We return with the pending snapshot still in the transaction's list;

3) Another task commits the transaction. This time there's no error at all, and then during the transaction commit it accesses a pointer to the pending snapshot structure that the snapshot creation task has already freed, resulting in a user-after-free.

This issue could actually be detected by smatch, which produced the following warning:

fs/btrfs/ioctl.c:843 createsnapshot() warn: '&pendingsnapshot->list' not removed from list

So fix this by not having the snapshot creation ioctl directly add the pending snapshot to the transaction's list. Instead add the pending snapshot to the transaction handle, and then at btrfscommittransaction() we add the snapshot to the list only when we can guarantee that any error returned after that point will result in a transaction abort, in which case the ioctl code can safely free the pending snapshot and no one can access it anymore.

Affected Software

133 affected componentsFixes available
Linux Linux kernel<5.15.22
Linux Linux kernel>=5.16<5.16.8
Linux Linux kernel<5.10.226
Linux Linux kernel>=5.11<5.15.22
Linux Linux kernel=5.17-rc1
Linux Linux kernel=5.17-rc2
debian/linux<5.16.10-1
5.16.10-1
debian/linux<5.16.10-1
5.16.10-1
debian/linux<5.16.10-1
5.16.10-1
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1
ubuntu/linux-aws<4.4.0-1138.144
4.4.0-1138.144
ubuntu/linux-azure<4.15.0-1183.198~14.04.1
4.15.0-1183.198~14.04.1
ubuntu/linux-lts-xenial<4.4.0-261.295~14.04.1
4.4.0-261.295~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-261.295
4.4.0-261.295
ubuntu/linux-aws<4.4.0-1176.191
4.4.0-1176.191
ubuntu/linux-aws-hwe<4.15.0-1175.188~16.04.1
4.15.0-1175.188~16.04.1
ubuntu/linux-azure<4.15.0-1183.198~16.04.1
4.15.0-1183.198~16.04.1
ubuntu/linux-gcp<4.15.0-1168.185~16.04.1
4.15.0-1168.185~16.04.1
ubuntu/linux-hwe<4.15.0-231.243~16.04.1
4.15.0-231.243~16.04.1
ubuntu/linux-kvm<4.4.0-1139.149
4.4.0-1139.149
ubuntu/linux-oracle<4.15.0-1137.148~16.04.1
4.15.0-1137.148~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1107.114
4.4.0-1107.114
ubuntu/linux-fips*
ubuntu/linux<4.15.0-231.243
4.15.0-231.243
ubuntu/linux-aws<4.15.0-1175.188
4.15.0-1175.188
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4<5.4.0-1136.146~18.04.1
5.4.0-1136.146~18.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-4.15<4.15.0-1183.198
4.15.0-1183.198
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4<5.4.0-1142.149~18.04.1
5.4.0-1142.149~18.04.1
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15<4.15.0-1168.185
4.15.0-1168.185
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4<5.4.0-1140.149~18.04.1
5.4.0-1140.149~18.04.1
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4<5.4.0-202.222~18.04.1
5.4.0-202.222~18.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4<5.4.0-1083.88~18.04.1
5.4.0-1083.88~18.04.1
ubuntu/linux-kvm<4.15.0-1158.163
4.15.0-1158.163
ubuntu/linux-oem*
ubuntu/linux-oracle<4.15.0-1137.148
4.15.0-1137.148
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4<5.4.0-1135.144~18.04.1
5.4.0-1135.144~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1120.132~18.04.1
5.4.0-1120.132~18.04.1
ubuntu/linux-aws-fips<4.15.0-2113.119
4.15.0-2113.119
ubuntu/linux-azure-fips<4.15.0-2092.98
4.15.0-2092.98
ubuntu/linux-fips<4.15.0-1129.140
4.15.0-1129.140
ubuntu/linux-gcp-fips<4.15.0-2076.81
4.15.0-2076.81
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-202.222
5.4.0-202.222
ubuntu/linux-aws<5.4.0-1136.146
5.4.0-1136.146
ubuntu/linux-azure<5.4.0-1142.149
5.4.0-1142.149
ubuntu/linux-bluefield<5.4.0-1096.103
5.4.0-1096.103
ubuntu/linux-gcp<5.4.0-1140.149
5.4.0-1140.149
ubuntu/linux-ibm<5.4.0-1083.88
5.4.0-1083.88
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<5.4.0-1045.46
5.4.0-1045.46
ubuntu/linux-kvm<5.4.0-1124.132
5.4.0-1124.132
ubuntu/linux-oracle<5.4.0-1135.144
5.4.0-1135.144
ubuntu/linux-raspi<5.4.0-1120.132
5.4.0-1120.132
ubuntu/linux-xilinx-zynqmp<5.4.0-1055.59
5.4.0-1055.59
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-azure-fde*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop*
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<5.4.0-1136.146+fips1
5.4.0-1136.146+fips1
ubuntu/linux-azure-fips<5.4.0-1142.149+fips1
5.4.0-1142.149+fips1
ubuntu/linux-fips<5.4.0-1110.120
5.4.0-1110.120
ubuntu/linux-gcp-fips<5.4.0-1140.149+fips1
5.4.0-1140.149+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-nvidia-6.2*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 5.16.10-1
  2. Upgrade

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

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
  3. Upgrade

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

    Fixed in 4.4.0-1138.144
  4. Upgrade

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

    Fixed in 4.15.0-1183.198~14.04.1
  5. Upgrade

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

    Fixed in 4.4.0-261.295~14.04.1
  6. Upgrade

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

    Fixed in 4.4.0-261.295
  7. Upgrade

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

    Fixed in 4.4.0-1176.191
  8. Upgrade

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

    Fixed in 4.15.0-1175.188~16.04.1
  9. Upgrade

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

    Fixed in 4.15.0-1183.198~16.04.1
  10. Upgrade

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

    Fixed in 4.15.0-1168.185~16.04.1
  11. Upgrade

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

    Fixed in 4.15.0-231.243~16.04.1
  12. Upgrade

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

    Fixed in 4.4.0-1139.149
  13. Upgrade

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

    Fixed in 4.15.0-1137.148~16.04.1
  14. Upgrade

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

    Fixed in 4.4.0-1107.114
  15. Upgrade

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

    Fixed in 4.15.0-231.243
  16. Upgrade

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

    Fixed in 4.15.0-1175.188
  17. Upgrade

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

    Fixed in 5.4.0-1136.146~18.04.1
  18. Upgrade

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

    Fixed in 4.15.0-1183.198
  19. Upgrade

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

    Fixed in 5.4.0-1142.149~18.04.1
  20. Upgrade

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

    Fixed in 4.15.0-1168.185
  21. Upgrade

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

    Fixed in 5.4.0-1140.149~18.04.1
  22. Upgrade

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

    Fixed in 5.4.0-202.222~18.04.1
  23. Upgrade

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

    Fixed in 5.4.0-1083.88~18.04.1
  24. Upgrade

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

    Fixed in 4.15.0-1158.163
  25. Upgrade

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

    Fixed in 4.15.0-1137.148
  26. Upgrade

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

    Fixed in 5.4.0-1135.144~18.04.1
  27. Upgrade

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

    Fixed in 5.4.0-1120.132~18.04.1
  28. Upgrade

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

    Fixed in 4.15.0-2113.119
  29. Upgrade

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

    Fixed in 4.15.0-2092.98
  30. Upgrade

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

    Fixed in 4.15.0-1129.140
  31. Upgrade

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

    Fixed in 4.15.0-2076.81
  32. Upgrade

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

    Fixed in 5.4.0-202.222
  33. Upgrade

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

    Fixed in 5.4.0-1136.146
  34. Upgrade

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

    Fixed in 5.4.0-1142.149
  35. Upgrade

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

    Fixed in 5.4.0-1096.103
  36. Upgrade

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

    Fixed in 5.4.0-1140.149
  37. Upgrade

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

    Fixed in 5.4.0-1083.88
  38. 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
  39. Upgrade

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

    Fixed in 5.4.0-1045.46
  40. Upgrade

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

    Fixed in 5.4.0-1124.132
  41. Upgrade

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

    Fixed in 5.4.0-1135.144
  42. Upgrade

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

    Fixed in 5.4.0-1120.132
  43. Upgrade

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

    Fixed in 5.4.0-1055.59
  44. Upgrade

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

    Fixed in 5.4.0-1136.146+fips1
  45. Upgrade

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

    Fixed in 5.4.0-1142.149+fips1
  46. Upgrade

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

    Fixed in 5.4.0-1110.120
  47. Upgrade

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

    Fixed in 5.4.0-1140.149+fips1

Event History

Jun 20, 2024
CVE Published
via MITRE·11:13 AM
Data Sourced
via MITRE·11:13 AM
DescriptionSeverity
Data Sourced
via OSV·12:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·12:15 PM
RemedyDescriptionSeverityWeaknessAffected Software

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2022-48733?

CVE-2022-48733 has been classified with a high severity due to its use-after-free vulnerability in the Linux kernel.

2

How do I fix CVE-2022-48733?

To fix CVE-2022-48733, upgrade to kernel versions 5.15.22 or greater, or install one of the patched versions such as 5.10.226-1 or 6.1.128-1.

3

Which versions of the Linux kernel are affected by CVE-2022-48733?

CVE-2022-48733 affects Linux kernel versions prior to 5.16.8 and between 5.15.22 and 5.16.

4

Is there a specific patch for CVE-2022-48733?

Yes, the patch for CVE-2022-48733 is included in subsequent kernel releases following 5.15.22.

5

What are the potential impacts of CVE-2022-48733?

The potential impacts of CVE-2022-48733 include susceptibility to denial of service and exploitation that could lead to arbitrary code execution.

Company

Resources

Contact

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