UBUNTU-CVE-2021-47254: Use After Free

Q: Which Ubuntu kernel packages are listed as affected?

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

Q: What level of access does an attacker need?

Exploitation requires local access and low privileges. User interaction is not required, but the vector indicates high attack complexity and additional attack requirements are present.

Q: What is the potential impact if exploitation succeeds?

The provided severity vector rates impacts to confidentiality, integrity, and availability as high for the vulnerable component. It does not indicate impacts to a subsequent component.

Published May 21, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2glockshrinkscan The GLFLRU flag is checked under lrulock in gfs2glockremovefromlru() to remove the glock from the lru list in gfs2glockput(). On the shrink scan path, the same flag is cleared under lrulock but because of condreschedlock(&lrulock) in gfs2disposeglocklru(), progress on the put side can be made without deleting the glock from the lru list. Keep GLFLRU across the race window opened by condreschedlock(&lrulock) to ensure correct behavior on both sides - clear GLFLRU after listdel under lrulock.

Affected Software

114 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1123.136~14.04.1

4.15.0-1123.136~14.04.1

ubuntu/linux-aws<4.4.0-1153.159

4.4.0-1153.159

ubuntu/linux-lts-xenial<4.4.0-279.313~14.04.1

4.4.0-279.313~14.04.1

ubuntu/linux<4.4.0-279.313

4.4.0-279.313

ubuntu/linux-aws<4.4.0-1191.206

4.4.0-1191.206

ubuntu/linux-aws-hwe<4.15.0-1111.118~16.04.1

4.15.0-1111.118~16.04.1

ubuntu/linux-azure<4.15.0-1123.136~16.04.1

4.15.0-1123.136~16.04.1

ubuntu/linux-gcp<4.15.0-1108.122~16.04.1

4.15.0-1108.122~16.04.1

ubuntu/linux-hwe<4.15.0-156.163~16.04.1

4.15.0-156.163~16.04.1

ubuntu/linux-kvm<4.4.0-1154.165

4.4.0-1154.165

ubuntu/linux-oracle<4.15.0-1080.88~16.04.1

4.15.0-1080.88~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1123.130

4.4.0-1123.130

ubuntu/linux-fips*

ubuntu/linux<4.15.0-156.163

4.15.0-156.163

ubuntu/linux-aws<4.15.0-1111.118

4.15.0-1111.118

ubuntu/linux-aws-5.4<5.4.0-1055.58~18.04.1

5.4.0-1055.58~18.04.1

ubuntu/linux-azure-4.15<4.15.0-1123.136

4.15.0-1123.136

ubuntu/linux-azure-5.4<5.4.0-1056.58~18.04.1

5.4.0-1056.58~18.04.1

ubuntu/linux-gcp-4.15<4.15.0-1108.122

4.15.0-1108.122

ubuntu/linux-gcp-5.4<5.4.0-1051.55~18.04.1

5.4.0-1051.55~18.04.1

ubuntu/linux-hwe-5.4<5.4.0-81.91~18.04.1

5.4.0-81.91~18.04.1

ubuntu/linux-kvm<4.15.0-1099.101

4.15.0-1099.101

ubuntu/linux-oracle<4.15.0-1080.88

4.15.0-1080.88

ubuntu/linux-oracle-5.4<5.4.0-1053.57~18.04.1

5.4.0-1053.57~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1042.46~18.04.3

5.4.0-1042.46~18.04.3

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<4.15.0-2053.55

4.15.0-2053.55

ubuntu/linux-azure-fips<4.15.0-2035.39

4.15.0-2035.39

ubuntu/linux-fips<4.15.0-1069.78

4.15.0-1069.78

ubuntu/linux-gcp-fips<4.15.0-2018.20

4.15.0-2018.20

ubuntu/linux-fips*

ubuntu/linux<5.4.0-81.91

5.4.0-81.91

ubuntu/linux-aws<5.4.0-1055.58

5.4.0-1055.58

ubuntu/linux-azure<5.4.0-1056.58

5.4.0-1056.58

ubuntu/linux-bluefield<5.4.0-1019.22

5.4.0-1019.22

ubuntu/linux-gcp<5.4.0-1051.55

5.4.0-1051.55

ubuntu/linux-gkeop<5.4.0-1022.23

5.4.0-1022.23

ubuntu/linux-kvm<5.4.0-1045.47

5.4.0-1045.47

ubuntu/linux-oracle<5.4.0-1053.57

5.4.0-1053.57

ubuntu/linux-raspi<5.4.0-1042.46

5.4.0-1042.46

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<5.4.0-1032.37

5.4.0-1032.37

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 4.15.0-1123.136~14.04.1
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1153.159
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-279.313~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-279.313
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1191.206
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1111.118~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1123.136~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1108.122~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-156.163~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1154.165
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1080.88~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1123.130
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-156.163
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1111.118
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.58~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1123.136
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1056.58~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1108.122
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1051.55~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-81.91~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1099.101
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1080.88
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1053.57~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1042.46~18.04.3
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2053.55
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2035.39
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1069.78
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2018.20
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-81.91
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.58
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1056.58
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1019.22
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1051.55
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.4.0-1022.23
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1045.47
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1053.57
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1042.46
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 5.4.0-1032.37
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1067.71~20.04.1

Event History

May 21, 2024

CVE Published

via OSV·03:15 PM

Data Sourced

via OSV·03:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

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

What level of access does an attacker need?

Exploitation requires local access and low privileges. User interaction is not required, but the vector indicates high attack complexity and additional attack requirements are present.

What is the potential impact if exploitation succeeds?

The provided severity vector rates impacts to confidentiality, integrity, and availability as high for the vulnerable component. It does not indicate impacts to a subsequent component.

UBUNTU-CVE-2021-47254: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

What level of access does an attacker need?

What is the potential impact if exploitation succeeds?

Company

Resources

Contact

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

What level of access does an attacker need?

What is the potential impact if exploitation succeeds?