CVE-2021-20177 PUBLISHED

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.

EPSS 0.04% · 12.8th percentile

Risk Scores

EPSS Score
0.04%
12.8th percentile

Affected Products

VendorProductVersions
Ubuntu:18.04:LTSlinux-azure-5.35.3.0-1008.9~18.04.1, 5.3.0-1009.10~18.04.1, 5.3.0-1010.11~18.04.1
Ubuntu:18.04:LTSlinux-aws-5.45.4.0-1025.25~18.04.1, 5.4.0-1028.29~18.04.1, 5.4.0-1029.30~18.04.1
Ubuntu:18.04:LTSlinux-oracle-5.05.0.0-1014.19, 5.0.0-1007.12~18.04.1, 5.0.0-1008.13~18.04.1
Ubuntu:Pro:FIPS-updates:20.04:LTSlinux-gcp-fips0, 5.4.0-1021.21+fips1
Ubuntu:18.04:LTSlinux-gcp4.15.0-1029.31, 4.15.0-1001.1, 4.15.0-1003.3
Ubuntu:18.04:LTSlinux-oracle-5.35.3.0-1014.15~18.04.1, 5.3.0-1018.20~18.04.1, 5.3.0-1016.18~18.04.1
Ubuntu:18.04:LTSlinux-azure-edge4.18.0-1006.6~18.04.1, 4.18.0-1008.8~18.04.1, 5.0.0-1012.12~18.04.2
Ubuntu:Pro:FIPS:20.04:LTSlinux-gcp-fips5.4.0-1021.21+fips1, 0
Ubuntu:24.04:LTSlinux-raspi-realtime6.8.0-2019.20, 0
Ubuntu:18.04:LTSlinux-gkeop-5.45.4.0-1001.1, 0, 5.4.0-1009.10~18.04.1
Ubuntu:20.04:LTSlinux-kvm5.4.0-1008.8, 5.4.0-1026.27, 5.4.0-1024.24
Ubuntu:18.04:LTSlinux-gke-5.45.4.0-1027.28~18.04.1, 5.4.0-1025.25~18.04.1, 0
Ubuntu:18.04:LTSlinux-raspi-5.45.4.0-1023.26~18.04.1, 5.4.0-1025.28~18.04.1, 5.4.0-1026.29~18.04.1
Ubuntu:Pro:FIPS-updates:20.04:LTSlinux-aws-fips0, 5.4.0-1021.21+fips2
Ubuntu:20.04:LTSlinux-raspi5.4.0-1007.7, 5.4.0-1011.11, 5.4.0-1012.12
Ubuntu:18.04:LTSlinux-hwe5.3.0-53.47~18.04.1, 0, 4.18.0-13.14~18.04.1
Ubuntu:20.04:LTSlinux-oracle5.4.0-1011.11, 5.4.0-1015.15, 5.4.0-1018.18
Ubuntu:18.04:LTSlinux-azure4.18.0-1011.11~18.04.1, 4.15.0-1036.38, 4.15.0-1035.36
Ubuntu:18.04:LTSlinux-hwe-edge0, 5.3.0-24.26~18.04.2, 5.3.0-23.25~18.04.2
Ubuntu:20.04:LTSlinux-riscv5.4.0-27.31, 5.4.0-28.32, 5.4.0-30.34

…and 22 more

Timeline

References

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