UBUNTU-CVE-2021-47500: Use After Free

Q: Who is exposed to this issue?

Systems running one of the listed Ubuntu Linux kernel packages may be exposed if they use the MMA8452 IIO driver and its trigger handling. The issue is local, so exploitation requires an attacker to have local access and low-level privileges.

Q: What does an attacker need to exploit it?

The CVSS vector indicates local access, low privileges, and no user interaction are required. The vulnerability is a use-after-free caused when the MMA8452 driver assigns a trigger without obtaining the matching trigger reference.

Q: What is the likely impact of successful exploitation?

Successful exploitation can affect confidentiality, integrity, and availability, all rated High in the supplied CVSS vector. The premature trigger free can leave a trigger in use after it has been freed.

Q: Which Ubuntu kernel package families are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

Published May 24, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iiodev. The IIO core when done using this trigger will call iiotriggerput() to drop the reference count by 1. Without the matching iiotriggerget() in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.

Affected Software

119 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1131.144~14.04.1

4.15.0-1131.144~14.04.1

ubuntu/linux-aws<4.4.0-1143.149

4.4.0-1143.149

ubuntu/linux-lts-xenial<4.4.0-268.302~14.04.1

4.4.0-268.302~14.04.1

ubuntu/linux<4.4.0-268.302

4.4.0-268.302

ubuntu/linux-aws<4.4.0-1181.196

4.4.0-1181.196

ubuntu/linux-aws-hwe<4.15.0-1120.128~16.04.1

4.15.0-1120.128~16.04.1

ubuntu/linux-azure<4.15.0-1131.144~16.04.1

4.15.0-1131.144~16.04.1

ubuntu/linux-gcp<4.15.0-1116.130~16.04.1

4.15.0-1116.130~16.04.1

ubuntu/linux-hwe<4.15.0-169.177~16.04.1

4.15.0-169.177~16.04.1

ubuntu/linux-kvm<4.4.0-1144.155

4.4.0-1144.155

ubuntu/linux-oracle<4.15.0-1087.95~16.04.1

4.15.0-1087.95~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1113.120

4.4.0-1113.120

ubuntu/linux-fips*

ubuntu/linux<4.15.0-169.177

4.15.0-169.177

ubuntu/linux-aws<4.15.0-1121.129

4.15.0-1121.129

ubuntu/linux-aws-5.4<5.4.0-1066.69~18.04.1

5.4.0-1066.69~18.04.1

ubuntu/linux-azure-4.15<4.15.0-1131.144

4.15.0-1131.144

ubuntu/linux-azure-5.4<5.4.0-1070.73~18.04.1

5.4.0-1070.73~18.04.1

ubuntu/linux-gcp-4.15<4.15.0-1116.130

4.15.0-1116.130

ubuntu/linux-gcp-5.4<5.4.0-1065.69~18.04.1

5.4.0-1065.69~18.04.1

ubuntu/linux-hwe-5.4<5.4.0-100.113~18.04.1

5.4.0-100.113~18.04.1

ubuntu/linux-ibm-5.4<5.4.0-1015.16~18.04.1

5.4.0-1015.16~18.04.1

ubuntu/linux-kvm<4.15.0-1107.109

4.15.0-1107.109

ubuntu/linux-oracle<4.15.0-1087.95

4.15.0-1087.95

ubuntu/linux-oracle-5.4<5.4.0-1064.68~18.04.1

5.4.0-1064.68~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1053.60~18.04.1

5.4.0-1053.60~18.04.1

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-aws-fips<4.15.0-2061.63

4.15.0-2061.63

ubuntu/linux-azure-fips<4.15.0-2043.47

4.15.0-2043.47

ubuntu/linux-fips<4.15.0-1078.87

4.15.0-1078.87

ubuntu/linux-gcp-fips<4.15.0-2026.28

4.15.0-2026.28

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-100.113

5.4.0-100.113

ubuntu/linux-aws<5.4.0-1066.69

5.4.0-1066.69

ubuntu/linux-azure<5.4.0-1070.73

5.4.0-1070.73

ubuntu/linux-bluefield<5.4.0-1028.31

5.4.0-1028.31

ubuntu/linux-gcp<5.4.0-1065.69

5.4.0-1065.69

ubuntu/linux-gkeop<5.4.0-1034.35

5.4.0-1034.35

ubuntu/linux-ibm<5.4.0-1015.16

5.4.0-1015.16

ubuntu/linux-kvm<5.4.0-1056.58

5.4.0-1056.58

ubuntu/linux-oracle<5.4.0-1064.68

5.4.0-1064.68

ubuntu/linux-raspi<5.4.0-1053.60

5.4.0-1053.60

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<5.4.0-1069.73+fips2

5.4.0-1069.73+fips2

ubuntu/linux-azure-fips<5.4.0-1073.76+fips1

5.4.0-1073.76+fips1

ubuntu/linux-fips<5.4.0-1043.49

5.4.0-1043.49

ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1

5.4.0-1067.71~20.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-nvidia-6.2*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-raspi-realtime*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1131.144~14.04.1
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1143.149
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-268.302~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-268.302
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1181.196
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1120.128~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1131.144~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1116.130~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-169.177~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1144.155
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1087.95~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1113.120
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-169.177
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1121.129
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1066.69~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1131.144
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1070.73~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1116.130
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1065.69~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-100.113~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1015.16~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1107.109
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1087.95
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1064.68~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1053.60~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2061.63
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2043.47
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1078.87
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2026.28
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-100.113
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1066.69
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1070.73
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1028.31
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1065.69
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.4.0-1034.35
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1015.16
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1056.58
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1064.68
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1053.60
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1069.73+fips2
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1073.76+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1043.49
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1067.71~20.04.1
Configuration
Get a reference to the trigger with iio_trigger_get() before assigning it to the IIO device, so the later iio_trigger_put() does not free the trigger while it is still in use.
Linux kernel iio: mma8452 driver trigger reference counting = call iio_trigger_get() before assigning the trigger to the struct iio_dev

Event History

May 24, 2024

CVE Published

via OSV·03:15 PM

Data Sourced

via OSV·03:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Who is exposed to this issue?

Systems running one of the listed Ubuntu Linux kernel packages may be exposed if they use the MMA8452 IIO driver and its trigger handling. The issue is local, so exploitation requires an attacker to have local access and low-level privileges.

What does an attacker need to exploit it?

The CVSS vector indicates local access, low privileges, and no user interaction are required. The vulnerability is a use-after-free caused when the MMA8452 driver assigns a trigger without obtaining the matching trigger reference.

What is the likely impact of successful exploitation?

Successful exploitation can affect confidentiality, integrity, and availability, all rated High in the supplied CVSS vector. The premature trigger free can leave a trigger in use after it has been freed.

Which Ubuntu kernel package families are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

UBUNTU-CVE-2021-47500: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Who is exposed to this issue?

What does an attacker need to exploit it?

What is the likely impact of successful exploitation?

Which Ubuntu kernel package families are listed as affected?

Company

Resources

Contact

Frequently Asked Questions

Who is exposed to this issue?

What does an attacker need to exploit it?

What is the likely impact of successful exploitation?

Which Ubuntu kernel package families are listed as affected?