CVE-2024-50086: ksmbd: fix user-after-free from session log off

Q: What is the severity of CVE-2024-50086?

The CVE-2024-50086 has a moderate severity level due to the user-after-free vulnerability in the Linux kernel.

Q: How do I fix CVE-2024-50086?

You can mitigate CVE-2024-50086 by updating the Linux kernel to a version that includes the fix, as detailed in the security advisories.

Q: Which versions of the Linux kernel are affected by CVE-2024-50086?

CVE-2024-50086 affects Linux kernel versions from 6.2 up to, but not including, 6.6.58, as well as some release candidates.

Q: What types of issues does CVE-2024-50086 cause?

CVE-2024-50086 can lead to potential memory corruption due to a race condition during the SMB2 session log off and setup.

Q: Is CVE-2024-50086 a remote exploitation risk?

Yes, CVE-2024-50086 can be exploited remotely under certain conditions, making it important to address promptly.

Published Oct 29, 2024

Updated

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

ksmbd: fix user-after-free from session log off

There is racy issue between smb2 session log off and smb2 session setup. It will cause user-after-free from session log off. This add sessionlock when setting SMB2SESSIONEXPIRED and referece count to session struct not to free session while it is being used.

Other sources

This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.

— Launchpad

Affected Software

161 affected componentsFixes available

Linux Linux kernel<6.1.114

Linux Linux kernel>=6.2<6.6.58

Linux Linux kernel>=6.7<6.11.5

Linux Linux kernel=6.12-rc1

Linux Linux kernel=6.12-rc2

Linux Linux kernel=6.12-rc3

debian/linux<6.1.115-1

6.1.115-1

debian/linux<6.11.5-1

6.11.5-1

debian/linux<6.11.5-1

6.11.5-1

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

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-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-5.15<5.15.0-1080.87~20.04.1

5.15.0-1080.87~20.04.1

ubuntu/linux-azure-5.15<5.15.0-1081.90~20.04.1

5.15.0-1081.90~20.04.1

ubuntu/linux-gcp-5.15<5.15.0-1077.86~20.04.1

5.15.0-1077.86~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-134.145~20.04.1

5.15.0-134.145~20.04.1

ubuntu/linux-ibm-5.15<5.15.0-1074.77~20.04.1

5.15.0-1074.77~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1073.79~20.04.2

5.15.0-1073.79~20.04.2

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-133.143~20.04.1

5.15.0-133.143~20.04.1

ubuntu/linux-oracle-5.15<5.15.0-1075.81~20.04.1

5.15.0-1075.81~20.04.1

ubuntu/linux-riscv-5.15<5.15.0-1073.77~20.04.1

5.15.0-1073.77~20.04.1

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-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-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1039.39~20.04.1

5.15.0-1039.39~20.04.1

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<5.15.0-133.144

5.15.0-133.144

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1078.85

5.15.0-1078.85

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1027.29~22.04.1

6.8.0-1027.29~22.04.1

ubuntu/linux-azure<5.15.0-1081.90

5.15.0-1081.90

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1025.30~22.04.1

6.8.0-1025.30~22.04.1

ubuntu/linux-azure-fde<5.15.0-1081.90.1

5.15.0-1081.90.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1077.86

5.15.0-1077.86

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1026.28~22.04.1

6.8.0-1026.28~22.04.1

ubuntu/linux-gke<5.15.0-1075.81

5.15.0-1075.81

ubuntu/linux-gkeop<5.15.0-1060.68

5.15.0-1060.68

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-57.59~22.04.1

6.8.0-57.59~22.04.1

ubuntu/linux-ibm<5.15.0-1070.73

5.15.0-1070.73

ubuntu/linux-ibm-6.8<6.8.0-1023.23~22.04.1

6.8.0-1023.23~22.04.1

ubuntu/linux-intel-iotg<5.15.0-1073.79

5.15.0-1073.79

ubuntu/linux-kvm<5.15.0-1076.81

5.15.0-1076.81

ubuntu/linux-lowlatency<5.15.0-133.143

5.15.0-133.143

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-56.58.1~22.04.1

6.8.0-56.58.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1072.73

5.15.0-1072.73

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1024.27~22.04.1

6.8.0-1024.27~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1033.33

5.15.0-1033.33

ubuntu/linux-nvidia-tegra-igx<5.15.0-1021.21

5.15.0-1021.21

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1075.81

5.15.0-1075.81

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1022.23~22.04.1

6.8.0-1022.23~22.04.1

ubuntu/linux-raspi<5.15.0-1072.75

5.15.0-1072.75

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-56.58.1~22.04.1

6.8.0-56.58.1~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1044.48

5.15.0-1044.48

ubuntu/linux-bluefield<5.15.0-1060.62

5.15.0-1060.62

ubuntu/linux-intel-iot-realtime<5.15.0-1071.73

5.15.0-1071.73

ubuntu/linux-realtime<5.15.0-1078.86

5.15.0-1078.86

ubuntu/linux-realtime-6.8<6.8.1-1018.19~22.04.1

6.8.1-1018.19~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1078.85+fips1

5.15.0-1078.85+fips1

ubuntu/linux-azure-fips<5.15.0-1080.89+fips1

5.15.0-1080.89+fips1

ubuntu/linux-fips<5.15.0-133.144+fips1

5.15.0-133.144+fips1

ubuntu/linux-gcp-fips<5.15.0-1077.86+fips1

5.15.0-1077.86+fips1

ubuntu/linux<6.8.0-56.58

6.8.0-56.58

ubuntu/linux-aws<6.8.0-1025.27

6.8.0-1025.27

ubuntu/linux-azure<6.8.0-1025.30

6.8.0-1025.30

ubuntu/linux-azure-6.11<6.11.0-1012.12~24.04.1

6.11.0-1012.12~24.04.1

ubuntu/linux-azure-nvidia<6.8.0-1014.15

6.8.0-1014.15

ubuntu/linux-gcp<6.8.0-1026.28

6.8.0-1026.28

ubuntu/linux-gcp-6.11<6.11.0-1011.11~24.04.1

6.11.0-1011.11~24.04.1

ubuntu/linux-gke<6.8.0-1021.25

6.8.0-1021.25

ubuntu/linux-gkeop<6.8.0-1008.10

6.8.0-1008.10

ubuntu/linux-ibm<6.8.0-1022.22

6.8.0-1022.22

ubuntu/linux-lowlatency<6.8.0-56.58.1

6.8.0-56.58.1

ubuntu/linux-nvidia<6.8.0-1024.27

6.8.0-1024.27

ubuntu/linux-nvidia-6.11<6.11.0-1007.7

6.11.0-1007.7

ubuntu/linux-nvidia-lowlatency<6.8.0-1024.27.1

6.8.0-1024.27.1

ubuntu/linux-nvidia-tegra<6.8.0-1004.4

6.8.0-1004.4

ubuntu/linux-oem-6.11<6.11.0-1015.15

6.11.0-1015.15

ubuntu/linux-oem-6.8<6.8.0-1024.24

6.8.0-1024.24

ubuntu/linux-oracle<6.8.0-1022.23

6.8.0-1022.23

ubuntu/linux-raspi<6.8.0-1028.32

6.8.0-1028.32

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv<6.8.0-56.58.1

6.8.0-56.58.1

ubuntu/linux-xilinx<6.8.0-1017.18

6.8.0-1017.18

ubuntu/linux-raspi-realtime<6.8.0-2023.24

6.8.0-2023.24

ubuntu/linux-realtime<6.8.1-1018.19

6.8.1-1018.19

ubuntu/linux-fips<6.8.0-78.78+fips1

6.8.0-78.78+fips1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.115-1
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.11.5-1
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
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1080.87~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1081.90~20.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1077.86~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-134.145~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1074.77~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1073.79~20.04.2
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-133.143~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1075.81~20.04.1
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1073.77~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1039.39~20.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-133.144
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1078.85
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1027.29~22.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1081.90
Upgrade
Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1025.30~22.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1081.90.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1077.86
Upgrade
Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1026.28~22.04.1
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1075.81
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.68
Upgrade
Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-57.59~22.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1070.73
Upgrade
Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1023.23~22.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1073.79
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1076.81
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-133.143
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-56.58.1~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1072.73
Upgrade
Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1024.27~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1033.33
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1021.21
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1075.81
Upgrade
Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1022.23~22.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1072.75
Upgrade
Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-56.58.1~22.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1044.48
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.62
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1071.73
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1078.86
Upgrade
Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1018.19~22.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1078.85+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1080.89+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-133.144+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1077.86+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.8.0-56.58
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 6.8.0-1025.27
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 6.8.0-1025.30
Upgrade
Upgrade ubuntu/linux-azure-6.11 to a version that resolves this vulnerability.
Fixed in 6.11.0-1012.12~24.04.1
Upgrade
Upgrade ubuntu/linux-azure-nvidia to a version that resolves this vulnerability.
Fixed in 6.8.0-1014.15
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 6.8.0-1026.28
Upgrade
Upgrade ubuntu/linux-gcp-6.11 to a version that resolves this vulnerability.
Fixed in 6.11.0-1011.11~24.04.1
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 6.8.0-1021.25
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 6.8.0-1008.10
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 6.8.0-1022.22
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-56.58.1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 6.8.0-1024.27
Upgrade
Upgrade ubuntu/linux-nvidia-6.11 to a version that resolves this vulnerability.
Fixed in 6.11.0-1007.7
Upgrade
Upgrade ubuntu/linux-nvidia-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-1024.27.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 6.8.0-1004.4
Upgrade
Upgrade ubuntu/linux-oem-6.11 to a version that resolves this vulnerability.
Fixed in 6.11.0-1015.15
Upgrade
Upgrade ubuntu/linux-oem-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1024.24
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 6.8.0-1022.23
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 6.8.0-1028.32
Upgrade
Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 6.8.0-56.58.1
Upgrade
Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.
Fixed in 6.8.0-1017.18
Upgrade
Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.
Fixed in 6.8.0-2023.24
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1018.19
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-78.78+fips1

Event History

Oct 29, 2024

CVE Published

via MITRE·12:50 AM

Data Sourced

via MITRE·12:50 AM

DescriptionSeverity

Data Sourced

via OSV·01:15 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·01:15 AM

RemedyDescriptionSeverityWeaknessAffected Software

Peer vulnerabilities

Found alongside the following vulnerabilities.

DLA-4008-1

Frequently Asked Questions

What is the severity of CVE-2024-50086?

The CVE-2024-50086 has a moderate severity level due to the user-after-free vulnerability in the Linux kernel.

How do I fix CVE-2024-50086?

You can mitigate CVE-2024-50086 by updating the Linux kernel to a version that includes the fix, as detailed in the security advisories.

Which versions of the Linux kernel are affected by CVE-2024-50086?

CVE-2024-50086 affects Linux kernel versions from 6.2 up to, but not including, 6.6.58, as well as some release candidates.

What types of issues does CVE-2024-50086 cause?

CVE-2024-50086 can lead to potential memory corruption due to a race condition during the SMB2 session log off and setup.

Is CVE-2024-50086 a remote exploitation risk?

Yes, CVE-2024-50086 can be exploited remotely under certain conditions, making it important to address promptly.

CVE-2024-50086: ksmbd: fix user-after-free from session log off

Other sources

Affected Software

Remediation

Event History

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2024-50086?

How do I fix CVE-2024-50086?

Which versions of the Linux kernel are affected by CVE-2024-50086?

What types of issues does CVE-2024-50086 cause?

Is CVE-2024-50086 a remote exploitation risk?

Company

Resources

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