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CVE-2020-25221 PUBLISHED

get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This can be triggered by any 64-bit process that can use ptrace() or process_vm_readv(), aka CID-9fa2dd946743.

EPSS 0.19% · 41.1th percentile

Risk Scores

EPSS Score
0.19%
41.1th percentile

Affected Products

VendorProductVersions
Ubuntu:18.04:LTSlinux-hwe-edge5.3.0-24.26~18.04.2, 5.3.0-23.25~18.04.2, 5.3.0-23.25~18.04.1
Ubuntu:Pro:14.04:LTSlinux-aws4.4.0-1151.157, 4.4.0-1152.158, 4.4.0-1115.121
Ubuntu:18.04:LTSlinux-gcp-edge4.18.0-1009.10~18.04.1, 5.0.0-1013.13~18.04.1, 5.0.0-1011.11~18.04.1
Ubuntu:18.04:LTSlinux-gcp4.15.0-1044.70, 5.0.0-1034.35, 5.0.0-1033.34
Ubuntu:18.04:LTSlinux-aws-5.05.0.0-1027.30, 5.0.0-1025.28, 5.0.0-1024.27~18.04.1
Ubuntu:18.04:LTSlinux-azure-5.35.3.0-1016.17~18.04.1, 0, 5.3.0-1007.8~18.04.1
Ubuntu:18.04:LTSlinux-azure5.0.0-1036.38, 4.15.0-1032.33, 4.15.0-1031.32
Ubuntu:18.04:LTSlinux-azure-edge5.0.0-1012.12~18.04.2, 4.18.0-1008.8~18.04.1, 4.18.0-1007.7~18.04.1
Ubuntu:18.04:LTSlinux-oracle-5.35.3.0-1027.29~18.04.1, 5.3.0-1028.30~18.04.1, 5.3.0-1030.32~18.04.1
Ubuntu:18.04:LTSlinux-aws-5.35.3.0-1034.36, 5.3.0-1035.37, 5.3.0-1016.17~18.04.1
Ubuntu:20.04:LTSlinux-raspi25.4.0-1004.4, 5.3.0-1015.17, 5.3.0-1014.16
Ubuntu:Pro:14.04:LTSlinux-azure4.15.0-1173.188~14.04.1, 0, 4.15.0-1023.24~14.04.1
Ubuntu:Pro:14.04:LTSlinux-lts-xenial4.4.0-253.287~14.04.1, 4.4.0-254.288~14.04.1, 4.4.0-256.290~14.04.1
Ubuntu:Pro:14.04:LTSlinux0, 3.13.0-7.25, 3.13.0-6.23
Ubuntu:18.04:LTSlinux-oracle-5.05.0.0-1008.13~18.04.1, 5.0.0-1014.19, 5.0.0-1013.18
Ubuntu:18.04:LTSlinux-gcp-5.30, 5.3.0-1008.9~18.04.1, 5.3.0-1009.10~18.04.1
Ubuntu:16.04:LTSlinux-hwe-edge4.15.0-20.21~16.04.1, 4.15.0-22.24~16.04.1, 4.15.0-23.25~16.04.1

Timeline

References

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