Information disclosure in Linux kernel - CVE-2021-45095

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Main Vulnerability Database Vulnerabilities #VU61579

Information disclosure in Linux kernel - CVE-2021-45095

Published: March 23, 2022


Vulnerability identifier: #VU61579
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-45095
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a refcount leak within the pep_sock_accept() function in net/phonet/pep.c in the Linux kernel. A local user can gain unauthorized access to sensitive information on the system.


Affected software

Linux kernel
Debian Linux
Slackware Linux
Ubuntu
Dell Secure Connect Gateway
linux-4.4.301/kernel-modules
linux-4.4.301/kernel-generic
linux-4.4.301/kernel-huge
linux-4.4.301/kernel-headers
linux-image-generic-hwe-16.04 (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-4.15.0-173-generic-lpae (Ubuntu package)
linux-image-4.15.0-173-lowlatency (Ubuntu package)
linux-image-4.15.0-173-generic (Ubuntu package)
linux-image-dell300x (Ubuntu package)
linux-image-4.15.0-1038-dell300x (Ubuntu package)
linux-image-4.15.0-1090-oracle (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-aws-hwe (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.15.0-1110-kvm (Ubuntu package)
linux-image-4.15.0-1119-gcp (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.15.0-1123-snapdragon (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1124-aws (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1134-azure (Ubuntu package)
linux (Debian package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-5.4.0-105-lowlatency (Ubuntu package)
linux-image-5.4.0-105-generic (Ubuntu package)
linux-image-5.4.0-105-generic-lpae (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1018-ibm (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1032-bluefield (Ubuntu package)
linux-image-5.4.0-1037-gkeop (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1056-raspi (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-5.4.0-1059-kvm (Ubuntu package)
linux-image-5.4.0-1066-gke (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-oracle-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1067-oracle (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.4.0-1068-gcp (Ubuntu package)
linux-image-gcp-lts-20.04 (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-aws-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1069-aws (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1073-azure (Ubuntu package)
linux-image-5.13.0-37-generic (Ubuntu package)
linux-image-5.13.0-37-generic-64k (Ubuntu package)
linux-image-5.13.0-37-lowlatency (Ubuntu package)
linux-image-5.13.0-37-generic-lpae (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.13.0-1018-kvm (Ubuntu package)
linux-image-5.13.0-1019-aws (Ubuntu package)
linux-image-5.13.0-1021-azure (Ubuntu package)
linux-image-5.13.0-1021-gcp (Ubuntu package)
linux-image-5.13.0-1022-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1022-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1023-oracle (Ubuntu package)
linux-image-5.13.0-1025-oracle (Ubuntu package)
linux-image-oem-20.04d (Ubuntu package)
linux-image-5.14.0-1022-oem (Ubuntu package)

How to mitigate CVE-2021-45095

Install updates from vendor's website.

Linux kernel - update to 5.15.9
Dell Secure Connect Gateway - update to 5.14.00.10
linux-4.4.301/kernel-modules - update to 4.4.301
linux-4.4.301/kernel-generic - update to 4.4.301
linux-4.4.301/kernel-huge - update to 4.4.301
linux-4.4.301/kernel-headers - update to 4.4.301_smp
linux-image-generic-hwe-16.04 (Ubuntu package) - update to 4.15.0.173.162
linux-image-generic (Ubuntu package) - addressed in versions 4.15.0.173.162, 5.4.0.105.109, 5.13.0.37.46
linux-image-virtual-hwe-16.04 (Ubuntu package) - update to 4.15.0.173.162
linux-image-generic-lpae (Ubuntu package) - addressed in versions 4.15.0.173.162, 5.4.0.105.109, 5.13.0.37.46
linux-image-lowlatency (Ubuntu package) - addressed in versions 4.15.0.173.162, 5.4.0.105.109, 5.13.0.37.46
linux-image-virtual (Ubuntu package) - addressed in versions 4.15.0.173.162, 5.4.0.105.109, 5.13.0.37.46
linux-image-lowlatency-hwe-16.04 (Ubuntu package) - update to 4.15.0.173.162
linux-image-4.15.0-173-generic-lpae (Ubuntu package) - update to 4.15.0-173.182
linux-image-4.15.0-173-lowlatency (Ubuntu package) - update to 4.15.0-173.182
linux-image-4.15.0-173-generic (Ubuntu package) - update to 4.15.0-173.182
linux-image-dell300x (Ubuntu package) - update to 4.15.0.1038.40
linux-image-4.15.0-1038-dell300x (Ubuntu package) - update to 4.15.0-1038.43
linux-image-4.15.0-1090-oracle (Ubuntu package) - update to 4.15.0-1090.99
linux-image-oracle-lts-18.04 (Ubuntu package) - update to 4.15.0.1090.100
linux-image-aws-hwe (Ubuntu package) - update to 4.15.0.1099.92
linux-image-kvm (Ubuntu package) - addressed in versions 4.15.0.1110.106, 5.4.0.1059.58, 5.13.0.1018.18
linux-image-4.15.0-1110-kvm (Ubuntu package) - update to 4.15.0-1110.113
linux-image-4.15.0-1119-gcp (Ubuntu package) - update to 4.15.0-1119.133
linux-image-gcp-lts-18.04 (Ubuntu package) - update to 4.15.0.1119.138
linux-image-snapdragon (Ubuntu package) - update to 4.15.0.1123.126
linux-image-4.15.0-1123-snapdragon (Ubuntu package) - update to 4.15.0-1123.132
linux-image-aws-lts-18.04 (Ubuntu package) - update to 4.15.0.1124.127
linux-image-4.15.0-1124-aws (Ubuntu package) - update to 4.15.0-1124.133
linux-image-azure-lts-18.04 (Ubuntu package) - update to 4.15.0.1134.107
linux-image-4.15.0-1134-azure (Ubuntu package) - update to 4.15.0-1134.147
linux (Debian package) - addressed in versions 4.19.232-1, 5.10.92-1
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.4.0.105.119~18.04.90
linux-image-oem (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.4.0.105.119~18.04.90
linux-image-5.4.0-105-lowlatency (Ubuntu package) - addressed in versions 5.4.0-105.119, 5.4.0-105.119~18.04.1
linux-image-5.4.0-105-generic (Ubuntu package) - addressed in versions 5.4.0-105.119, 5.4.0-105.119~18.04.1
linux-image-5.4.0-105-generic-lpae (Ubuntu package) - addressed in versions 5.4.0-105.119, 5.4.0-105.119~18.04.1
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-ibm (Ubuntu package) - addressed in versions 5.4.0.1018.18, 5.4.0.1018.35
linux-image-ibm-lts-20.04 (Ubuntu package) - update to 5.4.0.1018.18
linux-image-5.4.0-1018-ibm (Ubuntu package) - addressed in versions 5.4.0-1018.20, 5.4.0-1018.20~18.04.1
linux-image-bluefield (Ubuntu package) - update to 5.4.0.1032.33
linux-image-5.4.0-1032-bluefield (Ubuntu package) - update to 5.4.0-1032.35
linux-image-5.4.0-1037-gkeop (Ubuntu package) - addressed in versions 5.4.0-1037.38, 5.4.0-1037.38~18.04.1
linux-image-gkeop-5.4 (Ubuntu package) - addressed in versions 5.4.0.1037.38~18.04.37, 5.4.0.1037.40
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1037.40
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1056.58
linux-image-5.4.0-1056-raspi (Ubuntu package) - addressed in versions 5.4.0-1056.63, 5.4.0-1056.63~18.04.1
linux-image-raspi (Ubuntu package) - addressed in versions 5.4.0.1056.90, 5.13.0.1022.27
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1056.90
linux-image-5.4.0-1059-kvm (Ubuntu package) - update to 5.4.0-1059.62
linux-image-5.4.0-1066-gke (Ubuntu package) - addressed in versions 5.4.0-1066.69, 5.4.0-1066.69~18.04.1
linux-image-gke-5.4 (Ubuntu package) - addressed in versions 5.4.0.1066.69~18.04.30, 5.4.0.1066.76
linux-image-gke (Ubuntu package) - addressed in versions 5.4.0.1066.76, 5.8.0.1015.15, 5.13.0.1021.19
linux-image-oracle-lts-20.04 (Ubuntu package) - update to 5.4.0.1067.67
linux-image-5.4.0-1067-oracle (Ubuntu package) - addressed in versions 5.4.0-1067.72, 5.4.0-1067.72~18.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 5.4.0.1067.72~18.04.46, 5.13.0.1023.23, 5.13.0.1025.30~20.04.1
linux-image-gcp (Ubuntu package) - addressed in versions 5.4.0.1068.53, 5.13.0.1021.19, 5.13.0.1021.25~20.04.1
linux-image-5.4.0-1068-gcp (Ubuntu package) - addressed in versions 5.4.0-1068.72, 5.4.0-1068.72~18.04.1
linux-image-gcp-lts-20.04 (Ubuntu package) - update to 5.4.0.1068.77
linux-image-aws (Ubuntu package) - addressed in versions 5.4.0.1069.51, 5.13.0.1019.20, 5.13.0.1019.21~20.04.12
linux-image-aws-lts-20.04 (Ubuntu package) - update to 5.4.0.1069.71
linux-image-5.4.0-1069-aws (Ubuntu package) - addressed in versions 5.4.0-1069.73, 5.4.0-1069.73~18.04.1
linux-image-azure (Ubuntu package) - addressed in versions 5.4.0.1073.52, 5.13.0.1021.24~20.04.10
linux-image-azure-lts-20.04 (Ubuntu package) - update to 5.4.0.1073.71
linux-image-5.4.0-1073-azure (Ubuntu package) - addressed in versions 5.4.0-1073.76, 5.4.0-1073.76~18.04.1
linux-image-5.13.0-37-generic (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-5.13.0-37-generic-64k (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-5.13.0-37-lowlatency (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-5.13.0-37-generic-lpae (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-generic-64k (Ubuntu package) - update to 5.13.0.37.46
linux-image-oem-20.04 (Ubuntu package) - update to 5.13.0.37.46
linux-image-5.13.0-1018-kvm (Ubuntu package) - update to 5.13.0-1018.19
linux-image-5.13.0-1019-aws (Ubuntu package) - addressed in versions 5.13.0-1019.21, 5.13.0-1019.21~20.04.1
linux-image-5.13.0-1021-azure (Ubuntu package) - update to 5.13.0-1021.24~20.04.1
linux-image-5.13.0-1021-gcp (Ubuntu package) - addressed in versions 5.13.0-1021.25, 5.13.0-1021.25~20.04.1
linux-image-5.13.0-1022-raspi-nolpae (Ubuntu package) - update to 5.13.0-1022.24
linux-image-5.13.0-1022-raspi (Ubuntu package) - update to 5.13.0-1022.24
linux-image-raspi-nolpae (Ubuntu package) - update to 5.13.0.1022.27
linux-image-5.13.0-1023-oracle (Ubuntu package) - update to 5.13.0-1023.28
linux-image-5.13.0-1025-oracle (Ubuntu package) - update to 5.13.0-1025.30~20.04.1
linux-image-oem-20.04d (Ubuntu package) - update to 5.14.0.1022.19
linux-image-5.14.0-1022-oem (Ubuntu package) - update to 5.14.0-1022.24

External References

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