CVE-2022-49006: tracing: Free buffers when a used dynamic event is removed

Q: What is the severity of CVE-2022-49006?

The severity of CVE-2022-49006 is classified as a medium-level vulnerability.

Q: How do I fix CVE-2022-49006?

To fix CVE-2022-49006, it is recommended to update the Linux kernel to a version that addresses this vulnerability.

Q: Which versions of the Linux kernel are affected by CVE-2022-49006?

CVE-2022-49006 affects Linux kernel versions from 2.6.33 to 6.1-rc7.

Q: What are the potential impacts of CVE-2022-49006?

The potential impacts of CVE-2022-49006 include the possibility of a denial of service due to improper handling of dynamic events.

Q: When was CVE-2022-49006 first reported?

CVE-2022-49006 was first reported in 2022 as part of the ongoing security assessments of the Linux kernel.

Published Oct 21, 2024

Updated

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

tracing: Free buffers when a used dynamic event is removed

After 65536 dynamic events have been added and removed, the "type" field of the event then uses the first type number that is available (not currently used by other events). A type number is the identifier of the binary blobs in the tracing ring buffer (known as events) to map them to logic that can parse the binary blob.

The issue is that if a dynamic event (like a kprobe event) is traced and is in the ring buffer, and then that event is removed (because it is dynamic, which means it can be created and destroyed), if another dynamic event is created that has the same number that new event's logic on parsing the binary blob will be used.

To show how this can be an issue, the following can crash the kernel:

# cd /sys/kernel/tracing # for i in seq 65536; do echo 'p:kprobes/foo dosysopenat2 $arg1:u32' > kprobeevents # done

For every iteration of the above, the writing to the kprobeevents will remove the old event and create a new one (with the same format) and increase the type number to the next available on until the type number reaches over 65535 which is the max number for the 16 bit type. After it reaches that number, the logic to allocate a new number simply looks for the next available number. When an dynamic event is removed, that number is then available to be reused by the next dynamic event created. That is, once the above reaches the max number, the number assigned to the event in that loop will remain the same.

Now that means deleting one dynamic event and created another will reuse the previous events type number. This is where bad things can happen. After the above loop finishes, the kprobes/foo event which reads the dosysopenat2 function call's first parameter as an integer.

# echo 1 > kprobes/foo/enable # cat /etc/passwd > /dev/null # cat trace cat-2211 [005] .... 2007.849603: foo: (dosysopenat2+0x0/0x130) arg1=4294967196 cat-2211 [005] .... 2007.849620: foo: (dosysopenat2+0x0/0x130) arg1=4294967196 cat-2211 [005] .... 2007.849838: foo: (dosysopenat2+0x0/0x130) arg1=4294967196 cat-2211 [005] .... 2007.849880: foo: (dosysopenat2+0x0/0x130) arg1=4294967196 # echo 0 > kprobes/foo/enable

Now if we delete the kprobe and create a new one that reads a string:

# echo 'p:kprobes/foo dosysopenat2 +0($arg2):string' > kprobeevents

And now we can the trace:

# cat trace sendmail-1942 [002] ..... 530.136320: foo: (dosysopenat2+0x0/0x240) arg1= cat-2046 [004] ..... 530.930817: foo: (dosysopenat2+0x0/0x240) arg1="��" cat-2046 [004] ..... 530.930961: foo: (dosysopenat2+0x0/0x240) arg1="��" cat-2046 [004] ..... 530.934278: foo: (dosysopenat2+0x0/0x240) arg1="��" cat-2046 [004] ..... 530.934563: foo: (dosysopenat2+0x0/0x240) arg1="�� ---truncated---

Affected Software

173 affected componentsFixes available

Linux Linux kernel>=2.6.33<5.4.226

Linux Linux kernel>=5.5<5.10.158

Linux Linux kernel>=5.11<5.15.82

Linux Linux kernel>=5.16<6.0.12

Linux Linux kernel=6.1-rc1

Linux Linux kernel=6.1-rc2

Linux Linux kernel=6.1-rc3

Linux Linux kernel=6.1-rc4

Linux Linux kernel=6.1-rc5

Linux Linux kernel=6.1-rc6

Linux Linux kernel=6.1-rc7

debian/linux<6.0.12-1

6.0.12-1

debian/linux<6.0.12-1

6.0.12-1

debian/linux<6.0.12-1

6.0.12-1

debian/linux

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

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux-aws-5.4<5.4.0-1097.105~18.04.1

5.4.0-1097.105~18.04.1

ubuntu/linux-azure-5.4<5.4.0-1104.110~18.04.1

5.4.0-1104.110~18.04.1

ubuntu/linux-gcp-5.4<5.4.0-1101.110~18.04.1

5.4.0-1101.110~18.04.1

ubuntu/linux-hwe-5.4<5.4.0-144.161~18.04.1

5.4.0-144.161~18.04.1

ubuntu/linux-ibm-5.4<5.4.0-1045.50~18.04.1

5.4.0-1045.50~18.04.1

ubuntu/linux-oracle-5.4<5.4.0-1094.103~18.04.1

5.4.0-1094.103~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1081.92~18.04.1

5.4.0-1081.92~18.04.1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

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-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-144.161

5.4.0-144.161

ubuntu/linux-aws<5.4.0-1097.105

5.4.0-1097.105

ubuntu/linux-aws-5.15<5.15.0-1031.35~20.04.1

5.15.0-1031.35~20.04.1

ubuntu/linux-azure<5.4.0-1104.110

5.4.0-1104.110

ubuntu/linux-azure-5.15<5.15.0-1034.41~20.04.1

5.15.0-1034.41~20.04.1

ubuntu/linux-bluefield<5.4.0-1059.65

5.4.0-1059.65

ubuntu/linux-gcp<5.4.0-1101.110

5.4.0-1101.110

ubuntu/linux-gcp-5.15<5.15.0-1030.37~20.04.1

5.15.0-1030.37~20.04.1

ubuntu/linux-gkeop<5.4.0-1065.69

5.4.0-1065.69

ubuntu/linux-gkeop-5.15<5.15.0-1016.21~20.04.1

5.15.0-1016.21~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-67.74~20.04.1

5.15.0-67.74~20.04.1

ubuntu/linux-ibm<5.4.0-1045.50

5.4.0-1045.50

ubuntu/linux-intel-iotg-5.15<5.15.0-1026.31~20.04.1

5.15.0-1026.31~20.04.1

ubuntu/linux-iot<5.4.0-1013.15

5.4.0-1013.15

ubuntu/linux-kvm<5.4.0-1087.93

5.4.0-1087.93

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-67.74~20.04.1

5.15.0-67.74~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1014.14~20.04.1

5.15.0-1014.14~20.04.1

ubuntu/linux-oracle<5.4.0-1094.103

5.4.0-1094.103

ubuntu/linux-oracle-5.15<5.15.0-1030.36~20.04.1

5.15.0-1030.36~20.04.1

ubuntu/linux-raspi<5.4.0-1081.92

5.4.0-1081.92

ubuntu/linux-riscv-5.15<5.15.0-1030.34~20.04.1

5.15.0-1030.34~20.04.1

ubuntu/linux-xilinx-zynqmp<5.4.0-1022.26

5.4.0-1022.26

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-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<5.4.0-1099.107+fips1

5.4.0-1099.107+fips1

ubuntu/linux-azure-fips<5.4.0-1104.110+fips1

5.4.0-1104.110+fips1

ubuntu/linux-fips<5.4.0-1073.82

5.4.0-1073.82

ubuntu/linux-gcp-fips<5.4.0-1101.110+fips1

5.4.0-1101.110+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-67.74

5.15.0-67.74

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1031.35

5.15.0-1031.35

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-azure<5.15.0-1034.41

5.15.0-1034.41

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-fde<5.15.0-1034.41.1

5.15.0-1034.41.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1030.37

5.15.0-1030.37

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gke<5.15.0-1028.33

5.15.0-1028.33

ubuntu/linux-gkeop<5.15.0-1016.21

5.15.0-1016.21

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1026.29

5.15.0-1026.29

ubuntu/linux-intel-iotg<5.15.0-1026.31

5.15.0-1026.31

ubuntu/linux-kvm<5.15.0-1029.34

5.15.0-1029.34

ubuntu/linux-lowlatency<5.15.0-67.74

5.15.0-67.74

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-nvidia<5.15.0-1023.23

5.15.0-1023.23

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1030.36

5.15.0-1030.36

ubuntu/linux-oracle-6.5*

ubuntu/linux-raspi<5.15.0-1025.27

5.15.0-1025.27

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-bluefield<5.15.0-1014.16

5.15.0-1014.16

ubuntu/linux-intel-iot-realtime<5.15.0-1022.27

5.15.0-1022.27

ubuntu/linux-realtime<5.15.0-1033.36

5.15.0-1033.36

ubuntu/linux-raspi-realtime*

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 6.0.12-1
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-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1097.105~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1104.110~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1101.110~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-144.161~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1045.50~18.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1094.103~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1081.92~18.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-144.161
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1097.105
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1031.35~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1104.110
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1034.41~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1059.65
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1101.110
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.37~20.04.1
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.4.0-1065.69
Upgrade
Upgrade ubuntu/linux-gkeop-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1016.21~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-67.74~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1045.50
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1026.31~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1013.15
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1087.93
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-67.74~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1014.14~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1094.103
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.36~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1081.92
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.34~20.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1022.26
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1099.107+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1104.110+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1073.82
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1101.110+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-67.74
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1031.35
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1034.41
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1034.41.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.37
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1028.33
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1016.21
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1026.29
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1026.31
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1029.34
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-67.74
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1023.23
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1030.36
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1025.27
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1014.16
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1022.27
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1033.36

Event History

Oct 21, 2024

CVE Published

via MITRE·08:06 PM

Data Sourced

via MITRE·08:06 PM

Description

Data Sourced

via OSV·08:15 PM

DescriptionSeverityAffected Software

Data Sourced

via Red Hat·10:03 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

What is the severity of CVE-2022-49006?

The severity of CVE-2022-49006 is classified as a medium-level vulnerability.

How do I fix CVE-2022-49006?

To fix CVE-2022-49006, it is recommended to update the Linux kernel to a version that addresses this vulnerability.

Which versions of the Linux kernel are affected by CVE-2022-49006?

CVE-2022-49006 affects Linux kernel versions from 2.6.33 to 6.1-rc7.

What are the potential impacts of CVE-2022-49006?

The potential impacts of CVE-2022-49006 include the possibility of a denial of service due to improper handling of dynamic events.

When was CVE-2022-49006 first reported?

CVE-2022-49006 was first reported in 2022 as part of the ongoing security assessments of the Linux kernel.

CVE-2022-49006: tracing: Free buffers when a used dynamic event is removed

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2022-49006?

How do I fix CVE-2022-49006?

Which versions of the Linux kernel are affected by CVE-2022-49006?

What are the potential impacts of CVE-2022-49006?

When was CVE-2022-49006 first reported?

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