CVE-2023-32247: Linux Kernel ksmbd Session Setup Memory Exhaustion Denial-of-Service Vulnerability

Q: What is the severity of CVE-2023-32247?

CVE-2023-32247 has been rated as high severity due to its potential for resource exhaustion and denial of service attacks.

Q: How do I fix CVE-2023-32247?

To mitigate CVE-2023-32247, update the Linux kernel to version 6.4 or apply appropriate patches provided by your distribution.

Q: What versions of the Linux kernel are affected by CVE-2023-32247?

CVE-2023-32247 affects Linux kernel versions between 5.15.0 and 6.3.9, and also some specific versions of minor releases.

Q: Can CVE-2023-32247 be exploited remotely?

Yes, an attacker can exploit CVE-2023-32247 remotely through specially crafted SMB2_SESSION_SETUP commands.

Q: Which Linux distributions are impacted by CVE-2023-32247?

CVE-2023-32247 impacts multiple Linux distributions that utilize the affected kernel versions, including those based on Red Hat and Debian.

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 handling of SMB2SESSIONSETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Other sources

A memory exhaustion issue was found in ksmbd, a high-performance in-kernel SMB server. Quoting ZDI security advisory [1]:

"This vulnerability allows remote attackers to create a denial-of-service condition 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 handling of SMB2SESSIONSETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system."

[1] https://www.zerodayinitiative.com/advisories/ZDI-CAN-20478/

— Red Hat

Affected Software

112 affected componentsFixes available

redhat/kernel<6.4

6.4

Linux Linux kernel<=6.3.9

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 H300s

NetApp H410s

NetApp H500s

NetApp H700s

debian/linux

5.10.223-15.10.234-16.1.129-16.1.135-16.12.27-1

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<5.15.0-1056.61~20.04.1

5.15.0-1056.61~20.04.1

ubuntu/linux-azure-5.15<5.15.0-1059.67~20.04.1

5.15.0-1059.67~20.04.1

ubuntu/linux-gcp-5.15<5.15.0-1054.62~20.04.1

5.15.0-1054.62~20.04.1

ubuntu/linux-gkeop-5.15<5.15.0-1039.45~20.04.1

5.15.0-1039.45~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-101.111~20.04.1

5.15.0-101.111~20.04.1

ubuntu/linux-ibm-5.15<5.15.0-1049.52~20.04.1

5.15.0-1049.52~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1051.57~20.04.1

5.15.0-1051.57~20.04.1

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-101.111~20.04.1

5.15.0-101.111~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1025.25~20.04.1

5.15.0-1025.25~20.04.1

ubuntu/linux-oracle-5.15<5.15.0-1054.60~20.04.1

5.15.0-1054.60~20.04.1

ubuntu/linux-riscv-5.15<5.15.0-1052.56~20.04.1

5.15.0-1052.56~20.04.1

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-gke*

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<5.15.0-101.111

5.15.0-101.111

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1056.61

5.15.0-1056.61

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<5.15.0-1059.67

5.15.0-1059.67

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-fde<5.15.0-1059.67.1

5.15.0-1059.67.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-gcp<5.15.0-1054.62

5.15.0-1054.62

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<5.15.0-1053.58

5.15.0-1053.58

ubuntu/linux-gkeop<5.15.0-1039.45

5.15.0-1039.45

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<5.15.0-1049.52

5.15.0-1049.52

ubuntu/linux-intel-iotg<5.15.0-1051.57

5.15.0-1051.57

ubuntu/linux-kvm<5.15.0-1053.58

5.15.0-1053.58

ubuntu/linux-lowlatency<5.15.0-101.111

5.15.0-101.111

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<5.15.0-1047.47

5.15.0-1047.47

ubuntu/linux-nvidia-6.2<6.2.0-1010.10

6.2.0-1010.10

ubuntu/linux-nvidia-tegra<5.15.0-1025.25

5.15.0-1025.25

ubuntu/linux-nvidia-tegra-igx<5.15.0-1012.12

5.15.0-1012.12

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<5.15.0-1054.60

5.15.0-1054.60

ubuntu/linux-raspi<5.15.0-1049.52

5.15.0-1049.52

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-starfive-5.19*

ubuntu/linux-xilinx-zynqmp<5.15.0-1030.34

5.15.0-1030.34

ubuntu/linux-bluefield<5.15.0-1038.40

5.15.0-1038.40

ubuntu/linux-intel-iot-realtime<5.15.0-1049.51

5.15.0-1049.51

ubuntu/linux-realtime<5.15.0-1057.64

5.15.0-1057.64

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1056.61+fips1

5.15.0-1056.61+fips1

ubuntu/linux-azure-fips<5.15.0-1059.67+fips1

5.15.0-1059.67+fips1

ubuntu/linux-fips<5.15.0-101.111+fips1

5.15.0-101.111+fips1

ubuntu/linux-gcp-fips<5.15.0-1055.63+fips2

5.15.0-1055.63+fips2

ubuntu/linux-raspi-realtime*

ubuntu/linux-vmware*

Linux Kernel

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade redhat/kernel to a version that resolves this vulnerability.
Fixed in 6.4
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 6.12.27-1
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1056.61~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1059.67~20.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.62~20.04.1
Upgrade
Upgrade ubuntu/linux-gkeop-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1039.45~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-101.111~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1049.52~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1051.57~20.04.1
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-101.111~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1025.25~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.60~20.04.1
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1052.56~20.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-101.111
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1056.61
Upgrade
Upgrade ubuntu/linux-aws-6.2 to a version that resolves this vulnerability.
Fixed in 6.2.0-1011.11~22.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1059.67
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1059.67.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.62
Upgrade
Upgrade ubuntu/linux-gcp-6.2 to a version that resolves this vulnerability.
Fixed in 6.2.0-1013.13~22.04.1
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1053.58
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1039.45
Upgrade
Upgrade ubuntu/linux-hwe-6.2 to a version that resolves this vulnerability.
Fixed in 6.2.0-32.32~22.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1049.52
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1051.57
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1053.58
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-101.111
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
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1047.47
Upgrade
Upgrade ubuntu/linux-nvidia-6.2 to a version that resolves this vulnerability.
Fixed in 6.2.0-1010.10
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1025.25
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1012.12
Upgrade
Upgrade ubuntu/linux-oem-6.1 to a version that resolves this vulnerability.
Fixed in 6.1.0-1014.14
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1054.60
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1049.52
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.34
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1038.40
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1049.51
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.64
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1056.61+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1059.67+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-101.111+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.63+fips2

Event History

May 17, 2023

Advisory Published

via ZDI·12:00 AM

Data Sourced

via ZDI·12:00 AM

DescriptionSeverityAffected Software

Jul 24, 2023

CVE Published

via MITRE·03:19 PM

Data Sourced

via MITRE·03:19 PM

DescriptionSeverityWeakness

Data Sourced

04:15 PM

Description

Data Sourced

via OSV·04:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

What is the severity of CVE-2023-32247?

CVE-2023-32247 has been rated as high severity due to its potential for resource exhaustion and denial of service attacks.

How do I fix CVE-2023-32247?

To mitigate CVE-2023-32247, update the Linux kernel to version 6.4 or apply appropriate patches provided by your distribution.

What versions of the Linux kernel are affected by CVE-2023-32247?

CVE-2023-32247 affects Linux kernel versions between 5.15.0 and 6.3.9, and also some specific versions of minor releases.

Can CVE-2023-32247 be exploited remotely?

Yes, an attacker can exploit CVE-2023-32247 remotely through specially crafted SMB2_SESSION_SETUP commands.

Which Linux distributions are impacted by CVE-2023-32247?

CVE-2023-32247 impacts multiple Linux distributions that utilize the affected kernel versions, including those based on Red Hat and Debian.

CVE-2023-32247: Linux Kernel ksmbd Session Setup Memory Exhaustion Denial-of-Service Vulnerability

Other sources

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2023-32247?

How do I fix CVE-2023-32247?

What versions of the Linux kernel are affected by CVE-2023-32247?

Can CVE-2023-32247 be exploited remotely?

Which Linux distributions are impacted by CVE-2023-32247?

Company

Resources

Contact