UBUNTU-CVE-2022-49390: Use After Free

Q: What conditions are required to trigger this issue?

A MACsec device must be created without retaining a reference to its underlying real network device. If that real device is then freed before the MACsec device, subsequent MACsec link handling can access freed memory.

Q: Who is realistically exposed?

Systems using MACsec devices are exposed when their underlying network device can be removed or freed while the MACsec device remains. The reported trace involves creation of a veth device, indicating configurations involving virtual network interfaces may be relevant.

Q: What is the impact of successful exploitation?

The issue is a use-after-free in the kernel MACsec code. The supplied severity vector rates it high and indicates high impacts to confidentiality, integrity, and availability, with local access and low privileges required.

Q: How can I identify whether a system is affected?

Look for MACsec devices whose real or underlying network device has been deleted, detached, or otherwise freed while the MACsec device still exists. Kernel reports may show KASAN use-after-free messages referencing macsec_get_iflink, drivers/net/macsec.c, or linkwatch processing.

Published Feb 26, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: macsec: fix UAF bug for realdev Create a new macsec device but not get reference to realdev. That can not ensure that realdev is freed after macsec. That will trigger the UAF bug for realdev as following: ================================================================== BUG: KASAN: use-after-free in macsecgetiflink+0x5f/0x70 drivers/net/macsec.c:3662 Call Trace: ... macsecgetiflink+0x5f/0x70 drivers/net/macsec.c:3662 devgetiflink+0x73/0xe0 net/core/dev.c:637 defaultoperstate net/core/linkwatch.c:42 [inline] rfc2863policy+0x233/0x2d0 net/core/linkwatch.c:54 linkwatchdodev+0x2a/0x150 net/core/linkwatch.c:161 Allocated by task 22209: ... allocnetdevmqs+0x98/0x1100 net/core/dev.c:10549 rtnlcreatelink+0x9d7/0xc00 net/core/rtnetlink.c:3235 vethnewlink+0x20e/0xa90 drivers/net/veth.c:1748 Freed by task 8: ... kfree+0xd6/0x4d0 mm/slub.c:4552 kvfree+0x42/0x50 mm/util.c:615 devicerelease+0x9f/0x240 drivers/base/core.c:2229 kobjectcleanup lib/kobject.c:673 [inline] kobjectrelease lib/kobject.c:704 [inline] krefput include/linux/kref.h:65 [inline] kobjectput+0x1c8/0x540 lib/kobject.c:721 netdevruntodo+0x72e/0x10b0 net/core/dev.c:10327 After commit faab39f63c1f ("net: allow out-of-order netdev unregistration") and commit e5f80fcf869a ("ipv6: give an IPv6 dev to blackholenetdev"), we can add devholdtrack() in macsecdevinit() and devputtrack() in macsecfreenetdev() to fix the problem.

Affected Software

160 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1195.210~14.04.1

4.15.0-1195.210~14.04.1

ubuntu/linux-aws-hwe<4.15.0-1187.200~16.04.1

4.15.0-1187.200~16.04.1

ubuntu/linux-azure<4.15.0-1195.210~16.04.1

4.15.0-1195.210~16.04.1

ubuntu/linux-gcp<4.15.0-1180.197~16.04.1

4.15.0-1180.197~16.04.1

ubuntu/linux-hwe<4.15.0-245.257~16.04.1

4.15.0-245.257~16.04.1

ubuntu/linux-oracle<4.15.0-1149.160~16.04.1

4.15.0-1149.160~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux<4.15.0-245.257

4.15.0-245.257

ubuntu/linux-aws<4.15.0-1187.200

4.15.0-1187.200

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1153.163~18.04.1

5.4.0-1153.163~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1195.210

4.15.0-1195.210

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1156.163~18.04.1

5.4.0-1156.163~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1180.197

4.15.0-1180.197

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1156.165~18.04.1

5.4.0-1156.165~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-224.244~18.04.1

5.4.0-224.244~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1099.104~18.04.1

5.4.0-1099.104~18.04.1

ubuntu/linux-kvm<4.15.0-1169.174

4.15.0-1169.174

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1149.160

4.15.0-1149.160

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1151.161~18.04.1

5.4.0-1151.161~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1136.149~18.04.1

5.4.0-1136.149~18.04.1

ubuntu/linux-aws-fips<4.15.0-2125.131

4.15.0-2125.131

ubuntu/linux-azure-fips<4.15.0-2104.110

4.15.0-2104.110

ubuntu/linux-fips<4.15.0-1142.154

4.15.0-1142.154

ubuntu/linux-gcp-fips<4.15.0-2088.94

4.15.0-2088.94

ubuntu/linux-fips*

ubuntu/linux<5.4.0-224.244

5.4.0-224.244

ubuntu/linux-aws<5.4.0-1153.163

5.4.0-1153.163

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1098.105~20.04.1

5.15.0-1098.105~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1156.163

5.4.0-1156.163

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1102.111~20.04.1

5.15.0-1102.111~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield<5.4.0-1112.119

5.4.0-1112.119

ubuntu/linux-gcp<5.4.0-1156.165

5.4.0-1156.165

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1098.107~20.04.1

5.15.0-1098.107~20.04.1

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<5.15.0-164.174~20.04.1

5.15.0-164.174~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1099.104

5.4.0-1099.104

ubuntu/linux-ibm-5.15<5.15.0-1092.95~20.04.1

5.15.0-1092.95~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1093.99~20.04.1

5.15.0-1093.99~20.04.1

ubuntu/linux-iot<5.4.0-1057.60

5.4.0-1057.60

ubuntu/linux-kvm<5.4.0-1140.149

5.4.0-1140.149

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-164.174~20.04.1

5.15.0-164.174~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1050.50~20.04.1

5.15.0-1050.50~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle<5.4.0-1151.161

5.4.0-1151.161

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1095.101~20.04.1

5.15.0-1095.101~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1136.149

5.4.0-1136.149

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1093.97~20.04.2

5.15.0-1093.97~20.04.2

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1071.75

5.4.0-1071.75

ubuntu/linux-aws-fips<5.4.0-1153.163+fips1

5.4.0-1153.163+fips1

ubuntu/linux-azure-fips<5.4.0-1157.164+fips1

5.4.0-1157.164+fips1

ubuntu/linux-fips<5.4.0-1127.137

5.4.0-1127.137

ubuntu/linux-gcp-fips<5.4.0-1156.165+fips1

5.4.0-1156.165+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-164.174

5.15.0-164.174

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1098.105

5.15.0-1098.105

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-azure<5.15.0-1102.111

5.15.0-1102.111

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-fde<5.15.0-1102.111.1

5.15.0-1102.111.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1098.107

5.15.0-1098.107

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gke<5.15.0-1094.100

5.15.0-1094.100

ubuntu/linux-gkeop<5.15.0-1081.89

5.15.0-1081.89

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1092.95

5.15.0-1092.95

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1093.99

5.15.0-1093.99

ubuntu/linux-kvm<5.15.0-1090.95

5.15.0-1090.95

ubuntu/linux-lowlatency<5.15.0-164.174

5.15.0-164.174

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-nvidia<5.15.0-1093.94

5.15.0-1093.94

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-tegra<5.15.0-1050.50

5.15.0-1050.50

ubuntu/linux-nvidia-tegra-igx<5.15.0-1039.39

5.15.0-1039.39

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1095.101

5.15.0-1095.101

ubuntu/linux-oracle-6.5*

ubuntu/linux-raspi<5.15.0-1092.95

5.15.0-1092.95

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-xilinx-zynqmp<5.15.0-1062.66

5.15.0-1062.66

ubuntu/linux-bluefield<5.15.0-1082.84

5.15.0-1082.84

ubuntu/linux-intel-iot-realtime<5.15.0-1090.92

5.15.0-1090.92

ubuntu/linux-realtime<5.15.0-1097.106

5.15.0-1097.106

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1098.105+fips1

5.15.0-1098.105+fips1

ubuntu/linux-azure-fips<5.15.0-1102.111+fips1

5.15.0-1102.111+fips1

ubuntu/linux-fips<5.15.0-164.174+fips1

5.15.0-164.174+fips1

ubuntu/linux-gcp-fips<5.15.0-1098.107+fips1

5.15.0-1098.107+fips1

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 4.15.0-1195.210~14.04.1
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.200~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.210~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1180.197~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-245.257~16.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1149.160~16.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-245.257
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.200
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1153.163~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1195.210
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.163~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1180.197
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.165~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-224.244~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1099.104~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1169.174
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1149.160
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1136.149~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2125.131
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2104.110
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1142.154
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2088.94
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-224.244
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1153.163
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.105~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.163
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1102.111~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1112.119
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.165
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.107~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1099.104
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1092.95~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.99~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1057.60
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.149
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1050.50~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1095.101~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1136.149
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.97~20.04.2
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1071.75
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1153.163+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.164+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1127.137
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.165+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.105
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1102.111
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1102.111.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.107
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1094.100
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1081.89
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1092.95
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.99
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1090.95
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1093.94
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1050.50
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1039.39
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1095.101
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1092.95
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1062.66
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1082.84
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1090.92
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1097.106
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.105+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1102.111+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-164.174+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.107+fips1

Event History

Feb 26, 2025

CVE Published

via OSV·07:01 AM

Data Sourced

via OSV·07:01 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

What conditions are required to trigger this issue?

A MACsec device must be created without retaining a reference to its underlying real network device. If that real device is then freed before the MACsec device, subsequent MACsec link handling can access freed memory.

Who is realistically exposed?

Systems using MACsec devices are exposed when their underlying network device can be removed or freed while the MACsec device remains. The reported trace involves creation of a veth device, indicating configurations involving virtual network interfaces may be relevant.

What is the impact of successful exploitation?

The issue is a use-after-free in the kernel MACsec code. The supplied severity vector rates it high and indicates high impacts to confidentiality, integrity, and availability, with local access and low privileges required.

How can I identify whether a system is affected?

Look for MACsec devices whose real or underlying network device has been deleted, detached, or otherwise freed while the MACsec device still exists. Kernel reports may show KASAN use-after-free messages referencing macsec_get_iflink, drivers/net/macsec.c, or linkwatch processing.

UBUNTU-CVE-2022-49390: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

What conditions are required to trigger this issue?

Who is realistically exposed?

What is the impact of successful exploitation?

How can I identify whether a system is affected?

Company

Resources

Contact

Frequently Asked Questions

What conditions are required to trigger this issue?

Who is realistically exposed?

What is the impact of successful exploitation?

How can I identify whether a system is affected?