Resource exhaustion in Linux kernel - CVE-2020-10781

Vulnerability identifier: #VU47050

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-2020-10781

CWE-ID: CWE-400

Exploitation vector: Local access

Exploit availability: No public exploit available

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

A flaw was found in the Linux Kernel before 5.8-rc6 in the ZRAM kernel module, where a user with a local account and the ability to read the /sys/class/zram-control/hot_add file can create ZRAM device nodes in the /dev/ directory. This read allocates kernel memory and is not accounted for a user that triggers the creation of that ZRAM device. With this vulnerability, continually reading the device may consume a large amount of system memory and cause the Out-of-Memory (OOM) killer to activate and terminate random userspace processes, possibly making the system inoperable.

Linux kernel
Anolis OS
Ubuntu
linux-image-generic (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-4.15.0-115-generic (Ubuntu package)
linux-image-4.15.0-115-generic-lpae (Ubuntu package)
linux-image-4.15.0-115-lowlatency (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-4.15.0-1051-oracle (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1067-gke (Ubuntu package)
linux-image-gke-4.15 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.15.0-1068-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.15.0-1072-kvm (Ubuntu package)
linux-image-aws-hwe (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1080-aws (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-4.15.0-1081-gcp (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.15.0-1084-snapdragon (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-edge (Ubuntu package)
linux-image-4.15.0-1093-azure (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-4.15.0-1094-oem (Ubuntu package)
kernel
bpftool
python-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-headers
kernel-devel
kernel-debug-devel
kernel-debug
linux-image-oem-osp1 (Ubuntu package)
linux-image-5.4.0-45-generic (Ubuntu package)
linux-image-5.4.0-45-generic-lpae (Ubuntu package)
linux-image-5.4.0-45-lowlatency (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1016-raspi (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-aws-edge (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-5.4.0-1022-aws (Ubuntu package)
linux-image-5.4.0-1022-gcp (Ubuntu package)
linux-image-5.4.0-1022-oracle (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-1023-azure (Ubuntu package)

Install update from vendor's website.

linux-image-generic (Ubuntu package) - addressed in versions 4.15.0.115.103, 5.4.0.45.49
linux-image-generic-lpae (Ubuntu package) - addressed in versions 4.15.0.115.103, 5.4.0.45.49
linux-image-virtual (Ubuntu package) - addressed in versions 4.15.0.115.103, 5.4.0.45.49
linux-image-lowlatency (Ubuntu package) - addressed in versions 4.15.0.115.103, 5.4.0.45.49
linux-image-4.15.0-115-generic (Ubuntu package) - update to 4.15.0-115.116~16.04.1
linux-image-4.15.0-115-generic-lpae (Ubuntu package) - update to 4.15.0-115.116~16.04.1
linux-image-4.15.0-115-lowlatency (Ubuntu package) - update to 4.15.0-115.116~16.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 4.15.0.1051.42, 5.4.0.1022.7, 5.4.0.1022.20
linux-image-4.15.0-1051-oracle (Ubuntu package) - addressed in versions 4.15.0-1051.55, 4.15.0-1051.55~16.04.1
linux-image-oracle-lts-18.04 (Ubuntu package) - update to 4.15.0.1051.62
linux-image-4.15.0-1067-gke (Ubuntu package) - update to 4.15.0-1067.70
linux-image-gke-4.15 (Ubuntu package) - update to 4.15.0.1067.71
linux-image-gke (Ubuntu package) - addressed in versions 4.15.0.1067.71, 4.15.0.1081.83, 5.4.0.1022.20
linux-image-raspi2 (Ubuntu package) - addressed in versions 4.15.0.1068.66, 5.4.0.1016.51
linux-image-4.15.0-1068-raspi2 (Ubuntu package) - update to 4.15.0-1068.72
linux-image-kvm (Ubuntu package) - addressed in versions 4.15.0.1072.68, 5.4.0.1021.20
linux-image-4.15.0-1072-kvm (Ubuntu package) - update to 4.15.0-1072.73
linux-image-aws-hwe (Ubuntu package) - update to 4.15.0.1080.77
linux-image-aws-lts-18.04 (Ubuntu package) - update to 4.15.0.1080.82
linux-image-4.15.0-1080-aws (Ubuntu package) - addressed in versions 4.15.0-1080.84, 4.15.0-1080.84~16.04.1
linux-image-gcp (Ubuntu package) - addressed in versions 4.15.0.1081.83, 5.4.0.1022.9, 5.4.0.1022.20
linux-image-4.15.0-1081-gcp (Ubuntu package) - addressed in versions 4.15.0-1081.92, 4.15.0-1081.92~16.04.1
linux-image-gcp-lts-18.04 (Ubuntu package) - update to 4.15.0.1081.99
linux-image-snapdragon (Ubuntu package) - update to 4.15.0.1084.87
linux-image-4.15.0-1084-snapdragon (Ubuntu package) - update to 4.15.0-1084.92
linux-image-azure-lts-18.04 (Ubuntu package) - update to 4.15.0.1093.67
linux-image-azure (Ubuntu package) - addressed in versions 4.15.0.1093.70, 4.15.0.1093.88, 5.4.0.1023.7, 5.4.0.1023.22
linux-image-azure-edge (Ubuntu package) - update to 4.15.0.1093.88
linux-image-4.15.0-1093-azure (Ubuntu package) - addressed in versions 4.15.0-1093.103, 4.15.0-1093.103~14.04.1, 4.15.0-1093.103~16.04.1
linux-image-oem (Ubuntu package) - addressed in versions 4.15.0.1094.98, 5.4.0.45.49
linux-image-4.15.0-1094-oem (Ubuntu package) - update to 4.15.0-1094.104
kernel - update to 4.19.91-26
bpftool - update to 4.19.91-26
python-perf - update to 4.19.91-26
perf - update to 4.19.91-26
kernel-tools-libs-devel - update to 4.19.91-26
kernel-tools-libs - update to 4.19.91-26
kernel-tools - update to 4.19.91-26
kernel-headers - update to 4.19.91-26
kernel-devel - update to 4.19.91-26
kernel-debug-devel - update to 4.19.91-26
kernel-debug - update to 4.19.91-26
linux-image-oem-osp1 (Ubuntu package) - update to 5.4.0.45.49
linux-image-5.4.0-45-generic (Ubuntu package) - update to 5.4.0-45.49~18.04.2
linux-image-5.4.0-45-generic-lpae (Ubuntu package) - update to 5.4.0-45.49~18.04.2
linux-image-5.4.0-45-lowlatency (Ubuntu package) - update to 5.4.0-45.49~18.04.2
linux-image-gkeop-5.4 (Ubuntu package) - update to 5.4.0.45.49~18.04.38
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.45.49~18.04.38
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.45.49~18.04.38
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.45.49~18.04.38
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.45.49~18.04.38
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.45.49~18.04.38
linux-image-5.4.0-1016-raspi (Ubuntu package) - update to 5.4.0-1016.17~18.04.1
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1016.20
linux-image-raspi (Ubuntu package) - update to 5.4.0.1016.51
linux-image-aws-edge (Ubuntu package) - update to 5.4.0.1022.8
linux-image-gke-5.4 (Ubuntu package) - update to 5.4.0.1022.9
linux-image-5.4.0-1022-aws (Ubuntu package) - update to 5.4.0-1022.22~18.04.1
linux-image-5.4.0-1022-gcp (Ubuntu package) - update to 5.4.0-1022.22~18.04.1
linux-image-5.4.0-1022-oracle (Ubuntu package) - update to 5.4.0-1022.22~18.04.1
linux-image-aws (Ubuntu package) - update to 5.4.0.1022.23
linux-image-5.4.0-1023-azure (Ubuntu package) - update to 5.4.0-1023.23~18.04.1

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10781
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=853eab68afc80f59f36bbdeb715e5c88c501e680
• https://www.openwall.com/lists/oss-security/2020/06/18/1

• Anolis OS update for kernel(ANCK)4.19
• Ubuntu update for linux
• Ubuntu update for linux