CVE-2023-2008: Linux Kernel udmabuf Improper Validation of Array Index Local Privilege Escalation Vulnerability

Published Apr 13, 2023
·
Updated

A flaw was found in the Linux kernel's udmabuf device driver, within a fault handler. This issue occurs due to the lack of proper validation of user-supplied data, which can result in memory access past the end of an array. This may allow an attacker to escalate privileges and execute arbitrary code in the context of the kernel.

Other sources

A flaw was found in the Linux kernel's udmabuf device driver. The specific flaw exists within a fault handler. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an array. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.

A flaw was found in udmabuf. udmabuf is a linux device driver for user space mappable DMA buffer. Quoting ZDI security advisory [1]:

"This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within a fault handler. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an array. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel."

[1] https://www.zerodayinitiative.com/advisories/ZDI-23-441/

— Red Hat

Affected Software

108 affected componentsFixes available
Linux Linux kernel<5.19
Linux Linux kernel>=4.20<5.4.202
Linux Linux kernel>=5.5<5.10.127
Linux Linux kernel>=5.11<5.15.51
Linux Linux kernel>=5.16<5.18.8
Linux Linux kernel=5.19
Linux Linux kernel=5.19-rc1
Linux Linux kernel=5.19-rc2
Linux Linux kernel=5.19-rc3
redhat/kernel<5.19
5.19
Linux Kernel
debian/linux
6.1.176-16.1.190-16.12.107-16.12.113-17.2.12-17.2.13-1
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.4<5.4.0-1085.92~18.04.1
5.4.0-1085.92~18.04.1
ubuntu/linux-azure-5.4<5.4.0-1091.96~18.04.1
5.4.0-1091.96~18.04.1
ubuntu/linux-gcp-5.4<5.4.0-1089.97~18.04.1
5.4.0-1089.97~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-126.142~18.04.1
5.4.0-126.142~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1033.37~18.04.1
5.4.0-1033.37~18.04.1
ubuntu/linux-oracle-5.4<5.4.0-1083.91~18.04.1
5.4.0-1083.91~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1070.80~18.04.1
5.4.0-1070.80~18.04.1
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-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux<5.4.0-126.142
5.4.0-126.142
ubuntu/linux-aws<5.4.0-1085.92
5.4.0-1085.92
ubuntu/linux-aws-5.15<5.15.0-1020.24~20.04.1
5.15.0-1020.24~20.04.1
ubuntu/linux-azure<5.4.0-1091.96
5.4.0-1091.96
ubuntu/linux-azure-5.15<5.15.0-1020.25~20.04.1
5.15.0-1020.25~20.04.1
ubuntu/linux-bluefield<5.4.0-1046.51
5.4.0-1046.51
ubuntu/linux-gcp<5.4.0-1089.97
5.4.0-1089.97
ubuntu/linux-gcp-5.15<5.15.0-1018.24~20.04.1
5.15.0-1018.24~20.04.1
ubuntu/linux-gke<5.4.0-1083.89
5.4.0-1083.89
ubuntu/linux-gke-5.15<5.15.0-1016.19~20.04.1
5.15.0-1016.19~20.04.1
ubuntu/linux-gkeop<5.4.0-1053.56
5.4.0-1053.56
ubuntu/linux-hwe-5.15<5.15.0-48.54~20.04.1
5.15.0-48.54~20.04.1
ubuntu/linux-ibm<5.4.0-1033.37
5.4.0-1033.37
ubuntu/linux-intel-iotg-5.15<5.15.0-1016.21~20.04.1
5.15.0-1016.21~20.04.1
ubuntu/linux-iot<5.4.0-1004.6
5.4.0-1004.6
ubuntu/linux-kvm<5.4.0-1075.80
5.4.0-1075.80
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-48.54~20.04.1
5.15.0-48.54~20.04.1
ubuntu/linux-oracle<5.4.0-1083.91
5.4.0-1083.91
ubuntu/linux-oracle-5.15<5.15.0-1018.23~20.04.1
5.15.0-1018.23~20.04.1
ubuntu/linux-raspi<5.4.0-1070.80
5.4.0-1070.80
ubuntu/linux-riscv-5.15<5.15.0-1019.22~20.04.1
5.15.0-1019.22~20.04.1
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<5.4.0-1085.92+fips1
5.4.0-1085.92+fips1
ubuntu/linux-azure-fips<5.4.0-1091.96+fips1
5.4.0-1091.96+fips1
ubuntu/linux-fips<5.4.0-1061.69
5.4.0-1061.69
ubuntu/linux-gcp-fips<5.4.0-1089.97+fips1
5.4.0-1089.97+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-48.54
5.15.0-48.54
ubuntu/linux-aws<5.15.0-1020.24
5.15.0-1020.24
ubuntu/linux-azure<5.15.0-1020.25
5.15.0-1020.25
ubuntu/linux-azure-fde<5.15.0-1024.30.1
5.15.0-1024.30.1
ubuntu/linux-gcp<5.15.0-1018.24
5.15.0-1018.24
ubuntu/linux-gke<5.15.0-1016.19
5.15.0-1016.19
ubuntu/linux-gkeop<5.15.0-1003.5
5.15.0-1003.5
ubuntu/linux-ibm<5.15.0-1015.17
5.15.0-1015.17
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1016.21
5.15.0-1016.21
ubuntu/linux-kvm<5.15.0-1018.22
5.15.0-1018.22
ubuntu/linux-lowlatency<5.15.0-48.54
5.15.0-48.54
ubuntu/linux-nvidia<5.15.0-1007.7
5.15.0-1007.7
ubuntu/linux-oem-5.17*
ubuntu/linux-oracle<5.15.0-1018.23
5.15.0-1018.23
ubuntu/linux-raspi<5.15.0-1015.17
5.15.0-1015.17
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-realtime<5.15.0-1021.21
5.15.0-1021.21
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 5.19
  2. Upgrade

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

    Fixed in 5.4.0-1085.92~18.04.1
  3. Upgrade

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

    Fixed in 5.4.0-1091.96~18.04.1
  4. Upgrade

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

    Fixed in 5.4.0-1089.97~18.04.1
  5. Upgrade

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

    Fixed in 5.4.0-126.142~18.04.1
  6. Upgrade

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

    Fixed in 5.4.0-1033.37~18.04.1
  7. Upgrade

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

    Fixed in 5.4.0-1083.91~18.04.1
  8. Upgrade

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

    Fixed in 5.4.0-1070.80~18.04.1
  9. Upgrade

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

    Fixed in 5.4.0-126.142
  10. Upgrade

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

    Fixed in 5.4.0-1085.92
  11. Upgrade

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

    Fixed in 5.15.0-1020.24~20.04.1
  12. Upgrade

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

    Fixed in 5.4.0-1091.96
  13. Upgrade

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

    Fixed in 5.15.0-1020.25~20.04.1
  14. Upgrade

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

    Fixed in 5.4.0-1046.51
  15. Upgrade

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

    Fixed in 5.4.0-1089.97
  16. Upgrade

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

    Fixed in 5.15.0-1018.24~20.04.1
  17. Upgrade

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

    Fixed in 5.4.0-1083.89
  18. Upgrade

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

    Fixed in 5.15.0-1016.19~20.04.1
  19. Upgrade

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

    Fixed in 5.4.0-1053.56
  20. Upgrade

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

    Fixed in 5.15.0-48.54~20.04.1
  21. Upgrade

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

    Fixed in 5.4.0-1033.37
  22. Upgrade

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

    Fixed in 5.15.0-1016.21~20.04.1
  23. Upgrade

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

    Fixed in 5.4.0-1004.6
  24. Upgrade

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

    Fixed in 5.4.0-1075.80
  25. Upgrade

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

    Fixed in 5.15.0-48.54~20.04.1
  26. Upgrade

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

    Fixed in 5.4.0-1083.91
  27. Upgrade

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

    Fixed in 5.15.0-1018.23~20.04.1
  28. Upgrade

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

    Fixed in 5.4.0-1070.80
  29. Upgrade

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

    Fixed in 5.15.0-1019.22~20.04.1
  30. Upgrade

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

    Fixed in 5.4.0-1085.92+fips1
  31. Upgrade

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

    Fixed in 5.4.0-1091.96+fips1
  32. Upgrade

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

    Fixed in 5.4.0-1061.69
  33. Upgrade

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

    Fixed in 5.4.0-1089.97+fips1
  34. Upgrade

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

    Fixed in 5.15.0-48.54
  35. Upgrade

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

    Fixed in 5.15.0-1020.24
  36. Upgrade

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

    Fixed in 5.15.0-1020.25
  37. Upgrade

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

    Fixed in 5.15.0-1024.30.1
  38. Upgrade

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

    Fixed in 5.15.0-1018.24
  39. Upgrade

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

    Fixed in 5.15.0-1016.19
  40. Upgrade

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

    Fixed in 5.15.0-1003.5
  41. Upgrade

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

    Fixed in 5.15.0-1015.17
  42. Upgrade

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

    Fixed in 5.15.0-1016.21
  43. Upgrade

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

    Fixed in 5.15.0-1018.22
  44. Upgrade

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

    Fixed in 5.15.0-48.54
  45. Upgrade

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

    Fixed in 5.15.0-1007.7
  46. Upgrade

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

    Fixed in 5.15.0-1018.23
  47. Upgrade

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

    Fixed in 5.15.0-1015.17
  48. Upgrade

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

    Fixed in 5.15.0-1021.21
  49. 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 6.12.113-1Fixed in 7.2.12-1Fixed in 7.2.13-1

Event History

Apr 13, 2023
Advisory Published
via ZDI·12:00 AM
Data Sourced
via ZDI·12:00 AM
DescriptionSeverityAffected Software
Apr 14, 2023
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
DescriptionSeverityWeakness
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
Data Sourced
via Red Hat·04:41 PM
DescriptionSeverityAffected Software
Data Sourced
via OSV·09:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·09:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Jun 12, 2023
Exploit Published
via GitHub·02:41 PM

Frequently Asked Questions

1

What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is CVE-2023-2008.

2

What is the severity rating of CVE-2023-2008?

CVE-2023-2008 has a severity rating of 8.2 (high).

3

What software is affected by CVE-2023-2008?

Linux Kernel versions up to and including 5.19 are affected by CVE-2023-2008.

4

How can an attacker exploit CVE-2023-2008?

An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit CVE-2023-2008.

5

Where can I find more information about CVE-2023-2008?

You can find more information about CVE-2023-2008 on the following references: [Reference 1](https://github.com/torvalds/linux/commit/05b252cccb2e5c3f56119d25de684b4f810ba4), [Reference 2](https://www.zerodayinitiative.com/advisories/ZDI-23-441/), [Reference 3](https://access.redhat.com/errata/RHSA-2022:8267).

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