CVE-2023-32250: Linux Kernel ksmbd Session Race Condition Remote Code Execution Vulnerability

Published May 17, 2023
·
Updated

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2SESSIONSETUP commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Other sources

A vulnerability was found in fs/ksmbd/connection.c in ksmbd in the Linux Kernel. This flaw allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.

The specific flaw exists within the processing of SMB2SESSIONSETUP commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Reference: https://github.com/torvalds/linux/commit/f5c779b7ddbda30866cf2a27c63e34158f858c73 https://www.zerodayinitiative.com/advisories/ZDI-23-698/

— Red Hat

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable. The specific flaw exists within the processing of SMB2SESSIONSETUP commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

— ZDI

Affected Software

112 affected componentsFixes available
redhat/kernel<6.4
6.4
Linux Linux kernel<6.4
Linux Linux kernel>=5.15<5.15.145
Linux Linux kernel>=5.16<6.1.29
Linux Linux kernel>=6.2<6.2.16
Linux Linux kernel>=6.3<6.3.2
NetApp Hci
NetApp Hci Storage Nodes
NetApp H300s
NetApp H410s
NetApp H500s
NetApp H700s
Linux Kernel
ubuntu/linux-hwe-edge*
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-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-5.15<5.15.0-1053.58~20.04.1
5.15.0-1053.58~20.04.1
ubuntu/linux-azure-5.15<5.15.0-1056.64~20.04.1
5.15.0-1056.64~20.04.1
ubuntu/linux-gcp-5.15<5.15.0-1051.59~20.04.1
5.15.0-1051.59~20.04.1
ubuntu/linux-gkeop-5.15<5.15.0-1036.42~20.04.1
5.15.0-1036.42~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-94.104~20.04.1
5.15.0-94.104~20.04.1
ubuntu/linux-ibm-5.15<5.15.0-1046.49~20.04.1
5.15.0-1046.49~20.04.1
ubuntu/linux-intel-iotg-5.15<5.15.0-1048.54~20.04.1
5.15.0-1048.54~20.04.1
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-94.104~20.04.1
5.15.0-94.104~20.04.1
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1022.22~20.04.1
5.15.0-1022.22~20.04.1
ubuntu/linux-oracle-5.15<5.15.0-1051.57~20.04.1
5.15.0-1051.57~20.04.1
ubuntu/linux-riscv-5.15<5.15.0-1049.53~20.04.2
5.15.0-1049.53~20.04.2
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-gke-5.15*
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<5.15.0-94.104
5.15.0-94.104
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1053.58
5.15.0-1053.58
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2<6.2.0-1011.11~22.04.1
6.2.0-1011.11~22.04.1
ubuntu/linux-azure<5.15.0-1056.64
5.15.0-1056.64
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-fde<5.15.0-1056.64.1
5.15.0-1056.64.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-gcp<5.15.0-1051.59
5.15.0-1051.59
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2<6.2.0-1013.13~22.04.1
6.2.0-1013.13~22.04.1
ubuntu/linux-gke<5.15.0-1050.55
5.15.0-1050.55
ubuntu/linux-gkeop<5.15.0-1036.42
5.15.0-1036.42
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2<6.2.0-32.32~22.04.1
6.2.0-32.32~22.04.1
ubuntu/linux-ibm<5.15.0-1046.49
5.15.0-1046.49
ubuntu/linux-intel-iotg<5.15.0-1047.53
5.15.0-1047.53
ubuntu/linux-kvm<5.15.0-1050.55
5.15.0-1050.55
ubuntu/linux-lowlatency<5.15.0-94.104
5.15.0-94.104
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2<6.2.0-1012.12~22.04.1
6.2.0-1012.12~22.04.1
ubuntu/linux-nvidia<5.15.0-1044.44
5.15.0-1044.44
ubuntu/linux-nvidia-6.2<6.2.0-1010.10
6.2.0-1010.10
ubuntu/linux-nvidia-tegra<5.15.0-1022.22
5.15.0-1022.22
ubuntu/linux-nvidia-tegra-igx<5.15.0-1009.9
5.15.0-1009.9
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1<6.1.0-1014.14
6.1.0-1014.14
ubuntu/linux-oracle<5.15.0-1051.57
5.15.0-1051.57
ubuntu/linux-raspi<5.15.0-1046.49
5.15.0-1046.49
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-starfive-5.19*
ubuntu/linux-xilinx-zynqmp<5.15.0-1027.31
5.15.0-1027.31
ubuntu/linux-bluefield<5.15.0-1035.37
5.15.0-1035.37
ubuntu/linux-intel-iot-realtime<5.15.0-1046.48
5.15.0-1046.48
ubuntu/linux-realtime<5.15.0-1054.60
5.15.0-1054.60
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips<5.15.0-1053.58+fips1
5.15.0-1053.58+fips1
ubuntu/linux-fips<5.15.0-94.104+fips1
5.15.0-94.104+fips1
ubuntu/linux-gcp-fips<5.15.0-1055.63+fips2
5.15.0-1055.63+fips2
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 6.4
  2. Upgrade

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

    Fixed in 5.15.0-1053.58~20.04.1
  3. Upgrade

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

    Fixed in 5.15.0-1056.64~20.04.1
  4. Upgrade

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

    Fixed in 5.15.0-1051.59~20.04.1
  5. Upgrade

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

    Fixed in 5.15.0-1036.42~20.04.1
  6. Upgrade

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

    Fixed in 5.15.0-94.104~20.04.1
  7. Upgrade

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

    Fixed in 5.15.0-1046.49~20.04.1
  8. Upgrade

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

    Fixed in 5.15.0-1048.54~20.04.1
  9. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-94.104~20.04.1
  10. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1022.22~20.04.1
  11. Upgrade

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

    Fixed in 5.15.0-1051.57~20.04.1
  12. Upgrade

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

    Fixed in 5.15.0-1049.53~20.04.2
  13. Upgrade

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

    Fixed in 5.15.0-94.104
  14. Upgrade

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

    Fixed in 5.15.0-1053.58
  15. Upgrade

    Upgrade ubuntu/linux-aws-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1011.11~22.04.1
  16. Upgrade

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

    Fixed in 5.15.0-1056.64
  17. Upgrade

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

    Fixed in 5.15.0-1056.64.1
  18. Upgrade

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

    Fixed in 5.15.0-1051.59
  19. Upgrade

    Upgrade ubuntu/linux-gcp-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1013.13~22.04.1
  20. Upgrade

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

    Fixed in 5.15.0-1050.55
  21. Upgrade

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

    Fixed in 5.15.0-1036.42
  22. Upgrade

    Upgrade ubuntu/linux-hwe-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-32.32~22.04.1
  23. Upgrade

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

    Fixed in 5.15.0-1046.49
  24. Upgrade

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

    Fixed in 5.15.0-1047.53
  25. Upgrade

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

    Fixed in 5.15.0-1050.55
  26. Upgrade

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

    Fixed in 5.15.0-94.104
  27. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1012.12~22.04.1
  28. Upgrade

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

    Fixed in 5.15.0-1044.44
  29. Upgrade

    Upgrade ubuntu/linux-nvidia-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1010.10
  30. Upgrade

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

    Fixed in 5.15.0-1022.22
  31. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.

    Fixed in 5.15.0-1009.9
  32. Upgrade

    Upgrade ubuntu/linux-oem-6.1 to a version that resolves this vulnerability.

    Fixed in 6.1.0-1014.14
  33. Upgrade

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

    Fixed in 5.15.0-1051.57
  34. Upgrade

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

    Fixed in 5.15.0-1046.49
  35. Upgrade

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

    Fixed in 5.15.0-1027.31
  36. Upgrade

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

    Fixed in 5.15.0-1035.37
  37. Upgrade

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

    Fixed in 5.15.0-1046.48
  38. Upgrade

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

    Fixed in 5.15.0-1054.60
  39. Upgrade

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

    Fixed in 5.15.0-1053.58+fips1
  40. Upgrade

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

    Fixed in 5.15.0-94.104+fips1
  41. Upgrade

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

    Fixed in 5.15.0-1055.63+fips2
  42. 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 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1
  43. Upgrade

    Upgrade Linux kernel ksmbd to a version that resolves this vulnerability.

    Patch f5c779b7ddbda30866cf2a27c63e34158f858c73

Event History

May 17, 2023
Advisory Published
via ZDI·12:00 AM
Data Sourced
via ZDI·12:00 AM
DescriptionSeverityAffected Software
May 22, 2023
CVE Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
Event
via OSV·12:00 AM
Jul 10, 2023
CVE Published
via MITRE·03:09 PM
Data Sourced
via MITRE·03:09 PM
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2023-32250?

CVE-2023-32250 has been classified as a high severity vulnerability due to its potential impact on systems running the affected versions of the Linux kernel.

2

How do I fix CVE-2023-32250?

To fix CVE-2023-32250, upgrade to kernel versions 5.10.223-1, 5.10.226-1, 6.1.119-1, or later patched releases.

3

What versions of the Linux kernel are affected by CVE-2023-32250?

CVE-2023-32250 affects Linux kernel versions from 5.15.0 up to but not including 6.4.

4

Can CVE-2023-32250 be exploited remotely?

Yes, CVE-2023-32250 can be exploited remotely if the affected system is accessible over the network.

5

What components of the Linux kernel are impacted by CVE-2023-32250?

CVE-2023-32250 specifically impacts the ksmbd, which is a high-performance in-kernel SMB server.

Company

Resources

Contact

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