CVE-2020-25221

Published: 10 September 2020

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.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.13.0-16.19)
	focal	Not vulnerable (5.4.0-9.12)
	groovy	Not vulnerable (5.8.0-19.20)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by 3faa52c03f440d1b9ddef18c4f189f4790d52d7e Fixed by 9fa2dd946743ae6f30dc4830da19147bf100a7f2
linux-aws Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1001.1)
	focal	Not vulnerable (5.4.0-1005.5)
	groovy	Not vulnerable (5.8.0-1006.6)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.4.0-1001.10)
linux-aws-5.0 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-aws-5.3 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-aws-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1018.18~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.15.0-1030.31~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Not vulnerable (5.4.0-1006.6)
	groovy	Not vulnerable (5.8.0-1005.5)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.11.0-1009.9)
linux-azure-4.15 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1082.92)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-azure-5.3 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-azure-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1020.20~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Not vulnerable (5.4.0-1005.5)
	groovy	Not vulnerable (5.8.0-1003.3)
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.10.0-1004.4)
linux-gcp-4.15 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1071.81)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gcp-5.3 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gcp-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1019.19~18.04.2)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1030.32)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1011.11~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-gke-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1011.12~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-13.14~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
linux-hwe-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-37.41~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Ignored (end of life, was needs-triage)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1002.2)
	focal	Not vulnerable (5.4.0-1004.4)
	groovy	Not vulnerable (5.8.0-1002.2)
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.4.0-1004.9)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1002.3)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oem-5.6 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Not vulnerable (5.6.0-1007.7)
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1010.11)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1007.9)
	focal	Not vulnerable (5.4.0-1005.5)
	groovy	Not vulnerable (5.8.0-1002.2)
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.15.0-1007.9~16.04.1)
linux-oracle-5.0 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-oracle-5.3 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-oracle-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1019.19~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-raspi Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Not vulnerable (5.4.0-1007.7)
	groovy	Not vulnerable (5.8.0-1003.6)
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-raspi-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1013.13~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.13.0-1005.5)
	focal	Ignored (end of life, was needs-triage)
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-raspi2-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1017.19~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-riscv Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Not vulnerable (5.4.0-24.28)
	groovy	Not vulnerable (5.8.0-3.3)
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.4.0-1077.82)
	focal	Does not exist
	groovy	Does not exist
	trusty	Does not exist
	upstream	Released (5.9~rc4)
	xenial	Not vulnerable (4.4.0-1013.15)

Severity score breakdown

Parameter	Value
Base score	7.8
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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