Input validation error in Linux kernel - CVE-2021-29646

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Main Vulnerability Database Vulnerabilities #VU94153

Input validation error in Linux kernel - CVE-2021-29646

Published: March 30, 2021 / Updated: April 5, 2021


Vulnerability identifier: #VU94153
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-29646
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the tipc_nl_node_dump_monitor_peer() function in net/tipc/node.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Ubuntu
Fedora
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.6.0-1056-oem (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-5.8.0-53-generic-lpae (Ubuntu package)
linux-image-5.8.0-53-lowlatency (Ubuntu package)
linux-image-5.8.0-53-generic (Ubuntu package)
linux-image-5.8.0-53-generic-64k (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1024-raspi (Ubuntu package)
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.8.0-1027-kvm (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.8.0-1029-oracle (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.8.0-1031-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.8.0-1032-azure (Ubuntu package)
linux-image-5.8.0-1033-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.10.0-1026-oem (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
kernel
kernel-headers
kernel-tools

How to mitigate CVE-2021-29646

Install update from vendor's website.

kernel (Red Hat package) - update to 4.18.0-348.el8
kernel-rt (Red Hat package) - update to 4.18.0-348.rt7.130.el8
linux-image-oem-20.04 (Ubuntu package) - addressed in versions 5.6.0.1056.52, 5.8.0.53.58
linux-image-5.6.0-1056-oem (Ubuntu package) - update to 5.6.0-1056.60
linux-image-virtual (Ubuntu package) - update to 5.8.0.53.58
linux-image-lowlatency (Ubuntu package) - update to 5.8.0.53.58
linux-image-generic-lpae (Ubuntu package) - update to 5.8.0.53.58
linux-image-generic-64k (Ubuntu package) - update to 5.8.0.53.58
linux-image-generic (Ubuntu package) - update to 5.8.0.53.58
linux-image-5.8.0-53-generic-lpae (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-lowlatency (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic-64k (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-raspi (Ubuntu package) - update to 5.8.0.1024.27
linux-image-raspi-nolpae (Ubuntu package) - update to 5.8.0.1024.27
linux-image-5.8.0-1024-raspi (Ubuntu package) - update to 5.8.0-1024.27
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package) - update to 5.8.0-1024.27
linux-image-kvm (Ubuntu package) - update to 5.8.0.1027.29
linux-image-5.8.0-1027-kvm (Ubuntu package) - update to 5.8.0-1027.29
linux-image-oracle (Ubuntu package) - update to 5.8.0.1029.28
linux-image-5.8.0-1029-oracle (Ubuntu package) - update to 5.8.0-1029.30
linux-image-gcp (Ubuntu package) - update to 5.8.0.1031.31
linux-image-gke (Ubuntu package) - update to 5.8.0.1031.31
linux-image-5.8.0-1031-gcp (Ubuntu package) - update to 5.8.0-1031.32
linux-image-azure (Ubuntu package) - update to 5.8.0.1032.32
linux-image-5.8.0-1032-azure (Ubuntu package) - update to 5.8.0-1032.34
linux-image-5.8.0-1033-aws (Ubuntu package) - update to 5.8.0-1033.35
linux-image-aws (Ubuntu package) - update to 5.8.0.1033.35
linux-image-5.10.0-1026-oem (Ubuntu package) - update to 5.10.0-1026.27
linux-image-oem-20.04b (Ubuntu package) - update to 5.10.0.1026.27
kernel - addressed in versions 5.11.11-100.fc32, 5.11.11-200.fc33, 5.11.11-300.fc34
kernel-headers - addressed in versions 5.11.11-100.fc32, 5.11.11-200.fc33, 5.11.11-300.fc34
kernel-tools - addressed in versions 5.11.11-100.fc32, 5.11.11-200.fc33, 5.11.11-300.fc34

External References

Related Security Bulletins