UBUNTU-CVE-2025-37849: Use After Free

Q: Who is realistically exposed to this issue?

Systems using the affected Ubuntu kernel packages and running KVM on arm64 are exposed in the relevant failure path during virtual CPU creation. The flaw concerns vGIC vCPU state, so environments using the virtual interrupt controller are particularly relevant.

Q: What must occur for exploitation or impact to be possible?

Creation of a KVM vCPU must fail after the vCPU page cannot be shared with the hypervisor. In that error path, vGIC vCPU data remains initialized and later redistributor-device handling can access freed vCPU memory.

Q: Is a default configuration known to be affected?

The available information does not state whether a default Ubuntu installation or default KVM configuration reaches this condition. It identifies the affected path as arm64 KVM vCPU creation involving vGIC state and a failure to share a vCPU page with the hypervisor.

Q: How can administrators determine whether their systems are affected?

Identify whether the host runs one of the listed Ubuntu kernel packages and uses KVM on arm64. Investigate failed KVM vCPU creation events, especially failures involving sharing the vCPU page with the hypervisor, and subsequent redistributor-device activity.

Published May 9, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Tear down vGIC on failed vCPU creation If kvmarchvcpucreate() fails to share the vCPU page with the hypervisor, we propagate the error back to the ioctl but leave the vGIC vCPU data initialised. Note only does this leak the corresponding memory when the vCPU is destroyed but it can also lead to use-after-free if the redistributor device handling tries to walk into the vCPU. Add the missing cleanup to kvmarchvcpucreate(), ensuring that the vGIC vCPU structures are destroyed on error.

Affected Software

208 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1199.214~14.04.1

4.15.0-1199.214~14.04.1

ubuntu/linux-aws-hwe<4.15.0-1190.203~16.04.1

4.15.0-1190.203~16.04.1

ubuntu/linux-azure<4.15.0-1200.215~16.04.1

4.15.0-1200.215~16.04.1

ubuntu/linux-gcp<4.15.0-1183.200~16.04.2

4.15.0-1183.200~16.04.2

ubuntu/linux-hwe<4.15.0-248.260~16.04.1

4.15.0-248.260~16.04.1

ubuntu/linux-oracle<4.15.0-1153.164~16.04.1

4.15.0-1153.164~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux<4.15.0-248.260

4.15.0-248.260

ubuntu/linux-aws<4.15.0-1190.203

4.15.0-1190.203

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1157.167~18.04.1

5.4.0-1157.167~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1199.214

4.15.0-1199.214

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1161.167~18.04.1

5.4.0-1161.167~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1183.200

4.15.0-1183.200

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1160.169~18.04.1

5.4.0-1160.169~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-228.248~18.04.1

5.4.0-228.248~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1103.108~18.04.1

5.4.0-1103.108~18.04.1

ubuntu/linux-kvm<4.15.0-1172.177

4.15.0-1172.177

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1152.163

4.15.0-1152.163

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1155.165~18.04.1

5.4.0-1155.165~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1140.153~18.04.1

5.4.0-1140.153~18.04.1

ubuntu/linux-aws-fips<4.15.0-2128.134

4.15.0-2128.134

ubuntu/linux-azure-fips<4.15.0-2109.115

4.15.0-2109.115

ubuntu/linux-fips<4.15.0-1145.157

4.15.0-1145.157

ubuntu/linux-gcp-fips<4.15.0-2091.97

4.15.0-2091.97

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-228.248

5.4.0-228.248

ubuntu/linux-aws<5.4.0-1157.167

5.4.0-1157.167

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1104.111~20.04.1

5.15.0-1104.111~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1161.167

5.4.0-1161.167

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1110.119~20.04.1

5.15.0-1110.119~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield<5.4.0-1116.123

5.4.0-1116.123

ubuntu/linux-gcp<5.4.0-1160.169

5.4.0-1160.169

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1104.113~20.04.1

5.15.0-1104.113~20.04.1

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-5.15<5.15.0-176.186~20.04.1

5.15.0-176.186~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1103.108

5.4.0-1103.108

ubuntu/linux-ibm-5.15<5.15.0-1098.101~20.04.1

5.15.0-1098.101~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1099.105~20.04.1

5.15.0-1099.105~20.04.1

ubuntu/linux-iot<5.4.0-1061.64

5.4.0-1061.64

ubuntu/linux-kvm<5.4.0-1144.153

5.4.0-1144.153

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-174.184~20.04.1

5.15.0-174.184~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1057.57~20.04.1

5.15.0-1057.57~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle<5.4.0-1155.165

5.4.0-1155.165

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1101.107~20.04.1

5.15.0-1101.107~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1140.153

5.4.0-1140.153

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1098.102~20.04.1

5.15.0-1098.102~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1075.79

5.4.0-1075.79

ubuntu/linux-aws-fips<5.4.0-1157.167+fips1

5.4.0-1157.167+fips1

ubuntu/linux-azure-fips<5.4.0-1161.167+fips1

5.4.0-1161.167+fips1

ubuntu/linux-fips<5.4.0-1131.141

5.4.0-1131.141

ubuntu/linux-gcp-fips<5.4.0-1160.169+fips1

5.4.0-1160.169+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-174.184

5.15.0-174.184

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1104.111

5.15.0-1104.111

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1046.49~22.04.1

6.8.0-1046.49~22.04.1

ubuntu/linux-azure<5.15.0-1109.118

5.15.0-1109.118

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1051.57~22.04.1

6.8.0-1051.57~22.04.1

ubuntu/linux-azure-fde<5.15.0-1109.118.1

5.15.0-1109.118.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1046.53~22.04.1

6.8.0-1046.53~22.04.1

ubuntu/linux-gcp<5.15.0-1104.113

5.15.0-1104.113

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1047.50~22.04.2

6.8.0-1047.50~22.04.2

ubuntu/linux-gke<5.15.0-1100.106

5.15.0-1100.106

ubuntu/linux-gkeop<5.15.0-1087.95

5.15.0-1087.95

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-100.100~22.04.1

6.8.0-100.100~22.04.1

ubuntu/linux-ibm<5.15.0-1098.101

5.15.0-1098.101

ubuntu/linux-ibm-6.8<6.8.0-1044.44~22.04.1

6.8.0-1044.44~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1099.105

5.15.0-1099.105

ubuntu/linux-kvm<5.15.0-1096.101

5.15.0-1096.101

ubuntu/linux-lowlatency<5.15.0-174.184

5.15.0-174.184

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-100.100.1~22.04.1

6.8.0-100.100.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1099.100

5.15.0-1099.100

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1046.49~22.04.1

6.8.0-1046.49~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1056.56

5.15.0-1056.56

ubuntu/linux-nvidia-tegra-igx<5.15.0-1045.45

5.15.0-1045.45

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1101.107

5.15.0-1101.107

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1043.44~22.04.1

6.8.0-1043.44~22.04.1

ubuntu/linux-raspi<5.15.0-1098.101

5.15.0-1098.101

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-100.100~22.04.1

6.8.0-100.100~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1068.72

5.15.0-1068.72

ubuntu/linux-bluefield<5.15.0-1087.89

5.15.0-1087.89

ubuntu/linux-intel-iot-realtime<5.15.0-1096.98

5.15.0-1096.98

ubuntu/linux-realtime<5.15.0-1103.112

5.15.0-1103.112

ubuntu/linux-realtime-6.8<6.8.1-1041.42~22.04.1

6.8.1-1041.42~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1104.111+fips1

5.15.0-1104.111+fips1

ubuntu/linux-azure-fips<5.15.0-1109.118+fips1

5.15.0-1109.118+fips1

ubuntu/linux-fips<5.15.0-174.184+fips1

5.15.0-174.184+fips1

ubuntu/linux-gcp-fips<5.15.0-1104.113+fips1

5.15.0-1104.113+fips1

ubuntu/linux<6.8.0-100.100

6.8.0-100.100

ubuntu/linux-aws<6.8.0-1046.49

6.8.0-1046.49

ubuntu/linux-azure<6.8.0-1046.52

6.8.0-1046.52

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-fde<6.8.0-1046.53

6.8.0-1046.53

ubuntu/linux-azure-nvidia<6.8.0-1039.42

6.8.0-1039.42

ubuntu/linux-gcp<6.8.0-1047.50

6.8.0-1047.50

ubuntu/linux-gcp-6.11*

ubuntu/linux-gke<6.8.0-1043.48

6.8.0-1043.48

ubuntu/linux-gkeop<6.8.0-1030.33

6.8.0-1030.33

ubuntu/linux-hwe-6.11*

ubuntu/linux-ibm<6.8.0-1044.44

6.8.0-1044.44

ubuntu/linux-intel*

ubuntu/linux-lowlatency<6.8.0-100.100.1

6.8.0-100.100.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1046.49

6.8.0-1046.49

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-lowlatency<6.8.0-1046.49.1

6.8.0-1046.49.1

ubuntu/linux-nvidia-tegra<6.8.0-1020.20

6.8.0-1020.20

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1043.44

6.8.0-1043.44

ubuntu/linux-raspi<6.8.0-1047.51

6.8.0-1047.51

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-xilinx<6.8.0-1023.24

6.8.0-1023.24

ubuntu/linux-bluefield<6.8.0-1016.20

6.8.0-1016.20

ubuntu/linux-raspi-realtime<6.8.0-2037.38

6.8.0-2037.38

ubuntu/linux-realtime<6.8.1-1041.42

6.8.1-1041.42

ubuntu/linux-aws-fips<6.8.0-1046.49+fips1

6.8.0-1046.49+fips1

ubuntu/linux-azure-fips<6.8.0-1046.52+fips1

6.8.0-1046.52+fips1

ubuntu/linux-fips<6.8.0-100.100+fips1

6.8.0-100.100+fips1

ubuntu/linux-gcp-fips<6.8.0-1047.50+fips1

6.8.0-1047.50+fips1

ubuntu/linux-azure-fde*

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 4.15.0-1199.214~14.04.1
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1190.203~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1200.215~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1183.200~16.04.2
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-248.260~16.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1153.164~16.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-248.260
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1190.203
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.167~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1199.214
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1161.167~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1183.200
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1160.169~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-228.248~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1103.108~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1172.177
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1152.163
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1155.165~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.153~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2128.134
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2109.115
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1145.157
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2091.97
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-228.248
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.167
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.111~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1161.167
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.119~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1116.123
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1160.169
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.113~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-176.186~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1103.108
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.101~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1099.105~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1061.64
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1144.153
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-174.184~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.57~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1155.165
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1101.107~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.153
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.102~20.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1075.79
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.167+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1161.167+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1131.141
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1160.169+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-174.184
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.111
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1046.49~22.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1109.118
Upgrade
Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1051.57~22.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1109.118.1
Upgrade
Upgrade ubuntu/linux-azure-fde-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1046.53~22.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.113
Upgrade
Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1047.50~22.04.2
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1100.106
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1087.95
Upgrade
Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-100.100~22.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.101
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Fixed in 6.8.0-1047.50+fips1
Compensating control
In kvm_arch_vcpu_create(), destroy the vGIC vCPU structures when sharing the vCPU page with the hypervisor fails, so failed vCPU creation does not leave vGIC data initialized.

Event History

May 9, 2025

CVE Published

via OSV·07:16 AM

Data Sourced

via OSV·07:16 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

Who is realistically exposed to this issue?

Systems using the affected Ubuntu kernel packages and running KVM on arm64 are exposed in the relevant failure path during virtual CPU creation. The flaw concerns vGIC vCPU state, so environments using the virtual interrupt controller are particularly relevant.

What must occur for exploitation or impact to be possible?

Creation of a KVM vCPU must fail after the vCPU page cannot be shared with the hypervisor. In that error path, vGIC vCPU data remains initialized and later redistributor-device handling can access freed vCPU memory.

Is a default configuration known to be affected?

The available information does not state whether a default Ubuntu installation or default KVM configuration reaches this condition. It identifies the affected path as arm64 KVM vCPU creation involving vGIC state and a failure to share a vCPU page with the hypervisor.

How can administrators determine whether their systems are affected?

Identify whether the host runs one of the listed Ubuntu kernel packages and uses KVM on arm64. Investigate failed KVM vCPU creation events, especially failures involving sharing the vCPU page with the hypervisor, and subsequent redistributor-device activity.

UBUNTU-CVE-2025-37849: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Who is realistically exposed to this issue?

What must occur for exploitation or impact to be possible?

Is a default configuration known to be affected?

How can administrators determine whether their systems are affected?

Company

Resources

Contact

Frequently Asked Questions

Who is realistically exposed to this issue?

What must occur for exploitation or impact to be possible?

Is a default configuration known to be affected?

How can administrators determine whether their systems are affected?