CVE-2020-36694

2023-05-2100:00:00

ubuntu.com

linux kernel

netfilter

iptables

use-after-free vulnerability

cap_net_admin

unprivileged namespace

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

0.0004 Low

EPSS

Percentile

5.1%

JSON

An issue was discovered in netfilter in the Linux kernel before 5.10. There
can be a use-after-free in the packet processing context, because the
per-CPU sequence count is mishandled during concurrent iptables rules
replacement. This could be exploited with the CAP_NET_ADMIN capability in
an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-143.147UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-73.82UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-222.255UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1102.109UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1048.50UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1102.107UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1138.152UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1048.50~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1102.109~16.04.1UNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1047.49UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-143.147	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-73.82	UNKNOWN
ubuntu	16.04	noarch	linux	< 4.4.0-222.255	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1102.109	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1048.50	UNKNOWN
ubuntu	14.04	noarch	linux-aws	< 4.4.0-1102.107	UNKNOWN
ubuntu	16.04	noarch	linux-aws	< 4.4.0-1138.152	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1048.50~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1102.109~16.04.1	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1047.49	UNKNOWN