Infinite loop in Linux kernel - CVE-2020-27152

Vulnerability identifier: #VU52034

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-2020-27152

CWE-ID: CWE-835

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to infinite loop ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel. A local user can consume all available system resources and cause denial of service conditions.

Linux kernel
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Ubuntu
Red Hat Advanced Cluster Management for Kubernetes
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.6.0-1048-oem (Ubuntu package)
linux-image-5.8.0-31-generic (Ubuntu package)
linux-image-5.8.0-31-lowlatency (Ubuntu package)
linux-image-5.8.0-31-generic-lpae (Ubuntu package)
linux-image-5.8.0-31-generic-64k (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-5.8.0-33-generic (Ubuntu package)
linux-image-5.8.0-33-generic-64k (Ubuntu package)
linux-image-5.8.0-33-lowlatency (Ubuntu package)
linux-image-5.8.0-33-generic-lpae (Ubuntu package)
linux-image-5.8.0-1008-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-5.8.0-1008-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1010-raspi (Ubuntu package)
linux-image-5.8.0-1010-raspi-nolpae (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.8.0-1011-oracle (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.8.0-1011-kvm (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.8.0-1012-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.8.0-1013-oracle (Ubuntu package)
linux-image-5.8.0-1013-kvm (Ubuntu package)
linux-image-5.8.0-1013-azure (Ubuntu package)
linux-image-5.8.0-1014-gcp (Ubuntu package)
linux-image-5.8.0-1014-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.8.0-1015-azure (Ubuntu package)
linux-image-5.8.0-1016-aws (Ubuntu package)

Install updates from vendor's website.

Linux kernel - update to 5.9.2
Red Hat Advanced Cluster Management for Kubernetes - addressed in versions 2.0.10, 2.1.6, 2.2.2
kernel (Red Hat package) - update to 4.18.0-240.22.1.el8_3
kernel-rt (Red Hat package) - update to 4.18.0-240.22.1.rt7.77.el8_3
linux-image-oem-20.04 (Ubuntu package) - addressed in versions 5.6.0.1048.44, 5.8.0.31.36, 5.8.0.33.38
linux-image-5.6.0-1048-oem (Ubuntu package) - update to 5.6.0-1048.52
linux-image-5.8.0-31-generic (Ubuntu package) - update to 5.8.0-31.33
linux-image-5.8.0-31-lowlatency (Ubuntu package) - update to 5.8.0-31.33
linux-image-5.8.0-31-generic-lpae (Ubuntu package) - update to 5.8.0-31.33
linux-image-5.8.0-31-generic-64k (Ubuntu package) - update to 5.8.0-31.33
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.8.0.31.36, 5.8.0.33.38
linux-image-virtual (Ubuntu package) - addressed in versions 5.8.0.31.36, 5.8.0.33.38
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.8.0.31.36, 5.8.0.33.38
linux-image-generic (Ubuntu package) - addressed in versions 5.8.0.31.36, 5.8.0.33.38
linux-image-generic-64k (Ubuntu package) - addressed in versions 5.8.0.31.36, 5.8.0.33.38
linux-image-5.8.0-33-generic (Ubuntu package) - update to 5.8.0-33.36
linux-image-5.8.0-33-generic-64k (Ubuntu package) - update to 5.8.0-33.36
linux-image-5.8.0-33-lowlatency (Ubuntu package) - update to 5.8.0-33.36
linux-image-5.8.0-33-generic-lpae (Ubuntu package) - update to 5.8.0-33.36
linux-image-5.8.0-1008-raspi (Ubuntu package) - update to 5.8.0-1008.11
linux-image-raspi-nolpae (Ubuntu package) - addressed in versions 5.8.0.1008.11, 5.8.0.1010.13
linux-image-raspi (Ubuntu package) - addressed in versions 5.8.0.1008.11, 5.8.0.1010.13
linux-image-5.8.0-1008-raspi-nolpae (Ubuntu package) - update to 5.8.0-1008.11
linux-image-5.8.0-1010-raspi (Ubuntu package) - update to 5.8.0-1010.13
linux-image-5.8.0-1010-raspi-nolpae (Ubuntu package) - update to 5.8.0-1010.13
linux-image-oracle (Ubuntu package) - addressed in versions 5.8.0.1011.11, 5.8.0.1013.13
linux-image-5.8.0-1011-oracle (Ubuntu package) - update to 5.8.0-1011.11
linux-image-kvm (Ubuntu package) - addressed in versions 5.8.0.1011.12, 5.8.0.1013.15
linux-image-5.8.0-1011-kvm (Ubuntu package) - update to 5.8.0-1011.12
linux-image-gke (Ubuntu package) - addressed in versions 5.8.0.1012.12, 5.8.0.1014.14
linux-image-gcp (Ubuntu package) - addressed in versions 5.8.0.1012.12, 5.8.0.1014.14
linux-image-5.8.0-1012-gcp (Ubuntu package) - update to 5.8.0-1012.12
linux-image-azure (Ubuntu package) - addressed in versions 5.8.0.1013.13, 5.8.0.1015.15
linux-image-5.8.0-1013-oracle (Ubuntu package) - update to 5.8.0-1013.13
linux-image-5.8.0-1013-kvm (Ubuntu package) - update to 5.8.0-1013.14
linux-image-5.8.0-1013-azure (Ubuntu package) - update to 5.8.0-1013.14
linux-image-5.8.0-1014-gcp (Ubuntu package) - update to 5.8.0-1014.14
linux-image-5.8.0-1014-aws (Ubuntu package) - update to 5.8.0-1014.15
linux-image-aws (Ubuntu package) - addressed in versions 5.8.0.1014.16, 5.8.0.1016.18
linux-image-5.8.0-1015-azure (Ubuntu package) - update to 5.8.0-1015.16
linux-image-5.8.0-1016-aws (Ubuntu package) - update to 5.8.0-1016.17

• http://www.openwall.com/lists/oss-security/2020/11/03/1
• https://bugzilla.kernel.org/show_bug.cgi?id=208767
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.2
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=77377064c3a94911339f13ce113b3abf265e06da

• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes
• Ubuntu update for linux-oem-5.6
• Ubuntu update for linux
• Ubuntu update for linux
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes 2.2