Out-of-bounds read in Linux kernel - CVE-2021-20177

Vulnerability identifier: #VU92761

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20177

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

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

A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the system. Kernel before kernel 5.5-rc1 is affected.

Linux kernel
Ubuntu
openEuler
perf
kernel
bpftool
kernel-debugsource
kernel-tools
kernel-debuginfo
perf-debuginfo
python3-perf-debuginfo
python2-perf
python3-perf
bpftool-debuginfo
kernel-tools-devel
kernel-devel
kernel-tools-debuginfo
python2-perf-debuginfo
kernel-source
linux-image-oem (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-5.4.0-66-generic (Ubuntu package)
linux-image-5.4.0-66-generic-lpae (Ubuntu package)
linux-image-5.4.0-66-lowlatency (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1010-gkeop (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-5.4.0-1029-raspi (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1033-kvm (Ubuntu package)
linux-image-5.4.0-1036-gke (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.4.0-1037-gcp (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.4.0-1038-aws (Ubuntu package)
linux-image-5.4.0-1038-oracle (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.4.0-1040-azure (Ubuntu package)

Install update from vendor's repository.

perf - update to 4.19.90-2102.2.0.0057
kernel - update to 4.19.90-2102.2.0.0057
bpftool - update to 4.19.90-2102.2.0.0057
kernel-debugsource - update to 4.19.90-2102.2.0.0057
kernel-tools - update to 4.19.90-2102.2.0.0057
kernel-debuginfo - update to 4.19.90-2102.2.0.0057
perf-debuginfo - update to 4.19.90-2102.2.0.0057
python3-perf-debuginfo - update to 4.19.90-2102.2.0.0057
python2-perf - update to 4.19.90-2102.2.0.0057
python3-perf - update to 4.19.90-2102.2.0.0057
bpftool-debuginfo - update to 4.19.90-2102.2.0.0057
kernel-tools-devel - update to 4.19.90-2102.2.0.0057
kernel-devel - update to 4.19.90-2102.2.0.0057
kernel-tools-debuginfo - update to 4.19.90-2102.2.0.0057
python2-perf-debuginfo - update to 4.19.90-2102.2.0.0057
kernel-source - update to 4.19.90-2102.2.0.0057
linux-image-oem (Ubuntu package) - addressed in versions 5.4.0.66.69, 5.4.0.66.74~18.04.61
linux-image-virtual (Ubuntu package) - update to 5.4.0.66.69
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.4.0.66.69, 5.4.0.66.74~18.04.61
linux-image-lowlatency (Ubuntu package) - update to 5.4.0.66.69
linux-image-generic-lpae (Ubuntu package) - update to 5.4.0.66.69
linux-image-generic (Ubuntu package) - update to 5.4.0.66.69
linux-image-5.4.0-66-generic (Ubuntu package) - addressed in versions 5.4.0-66.74, 5.4.0-66.74~18.04.2
linux-image-5.4.0-66-generic-lpae (Ubuntu package) - addressed in versions 5.4.0-66.74, 5.4.0-66.74~18.04.2
linux-image-5.4.0-66-lowlatency (Ubuntu package) - addressed in versions 5.4.0-66.74, 5.4.0-66.74~18.04.2
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.66.74~18.04.61
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.66.74~18.04.61
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.66.74~18.04.61
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.66.74~18.04.61
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.66.74~18.04.61
linux-image-5.4.0-1010-gkeop (Ubuntu package) - addressed in versions 5.4.0-1010.11, 5.4.0-1010.11~18.04.1
linux-image-gkeop-5.4 (Ubuntu package) - addressed in versions 5.4.0.1010.11~18.04.11, 5.4.0.1010.13
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1010.13
linux-image-5.4.0-1029-raspi (Ubuntu package) - addressed in versions 5.4.0-1029.32, 5.4.0-1029.32~18.04.1
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1029.32
linux-image-raspi (Ubuntu package) - update to 5.4.0.1029.64
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1029.64
linux-image-kvm (Ubuntu package) - update to 5.4.0.1033.31
linux-image-5.4.0-1033-kvm (Ubuntu package) - update to 5.4.0-1033.34
linux-image-5.4.0-1036-gke (Ubuntu package) - update to 5.4.0-1036.38~18.04.1
linux-image-gke-5.4 (Ubuntu package) - update to 5.4.0.1036.38~18.04.4
linux-image-gcp (Ubuntu package) - addressed in versions 5.4.0.1037.24, 5.4.0.1037.46
linux-image-5.4.0-1037-gcp (Ubuntu package) - addressed in versions 5.4.0-1037.40, 5.4.0-1037.40~18.04.1
linux-image-aws (Ubuntu package) - addressed in versions 5.4.0.1038.22, 5.4.0.1038.39
linux-image-oracle (Ubuntu package) - addressed in versions 5.4.0.1038.35, 5.4.0.1038.41~18.04.21
linux-image-5.4.0-1038-aws (Ubuntu package) - addressed in versions 5.4.0-1038.40, 5.4.0-1038.40~18.04.1
linux-image-5.4.0-1038-oracle (Ubuntu package) - addressed in versions 5.4.0-1038.41, 5.4.0-1038.41~18.04.1
linux-image-azure (Ubuntu package) - addressed in versions 5.4.0.1040.20, 5.4.0.1040.38
linux-image-5.4.0-1040-azure (Ubuntu package) - addressed in versions 5.4.0-1040.42, 5.4.0-1040.42~18.04.1

• https://bugzilla.redhat.com/show_bug.cgi?id=1914719

• Out-of-bounds read in Linux kernel
• Ubuntu update for linux
• openEuler 20.03 LTS SP1 update for kernel