NVD Vulnerability Detail

CVE-2020-25221

Summary	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.
Publication Date	Sept. 10, 2020, 11:15 p.m.
Registration Date	Jan. 26, 2021, 11:55 a.m.
Last Update	Nov. 21, 2024, 2:17 p.m.

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:o:linux:linux_kernel::::::::		5.7.0			5.8.7

Configuration2	or higher	or less	more than	less than
cpe:2.3:a:netapp:cloud_backup:-:::::::*
cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:::::::*
cpe:2.3:h:netapp:hci_compute_node:-:::::::*
cpe:2.3:h:netapp:solidfire_baseboard_management_controller:-:::::::*
cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:::::::*

Related information, measures and tools

No	URL	タグ
1	http://www.openwall.com/lists/oss-security/2020/09/10/4	Mailing List Third Party Advisory
2	http://www.openwall.com/lists/oss-security/2020/09/10/4	Mailing List Third Party Advisory
3	https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7	Release Notes Vendor Advisory
4	https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7	Release Notes Vendor Advisory
5	https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a	Issue Tracking Patch Vendor Advisory
6	https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a	Issue Tracking Patch Vendor Advisory
7	https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2	Issue Tracking Patch Vendor Advisory
8	https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2	Issue Tracking Patch Vendor Advisory
9	https://security.netapp.com/advisory/ntap-20201001-0003/	Third Party Advisory
10	https://security.netapp.com/advisory/ntap-20201001-0003/	Third Party Advisory
11	https://www.openwall.com/lists/oss-security/2020/09/08/4	Mailing List Patch Third Party Advisory
12	https://www.openwall.com/lists/oss-security/2020/09/08/4	Mailing List Patch Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-672	有効期限後または解放後のリソースの操作	https://cwe.mitre.org/data/definitions/672.html

JVN Vulnerability Information

Linux Kernel における有効期限後または解放後のリソースの操作に関する脆弱性

Title	Linux Kernel における有効期限後または解放後のリソースの操作に関する脆弱性
Summary	Linux Kernel には、有効期限後または解放後のリソースの操作に関する脆弱性が存在します。ベンダは、本脆弱性を CID-9fa2dd946743 として公開しています。
Possible impacts	情報を取得される、情報を改ざんされる、およびサービス運用妨害 (DoS) 状態にされる可能性があります。
Solution	ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date	Sept. 5, 2020, midnight
Registration Date	March 3, 2021, 11:41 a.m.
Last Update	March 3, 2021, 11:41 a.m.

Affected System

Linux

Linux Kernel 5.7.x

Linux Kernel 5.8.7 未満の 5.8.x

CVE (情報セキュリティ共通脆弱性識別子)

No	Name	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2020-25221	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25221
National Vulnerability Database (NVD)
2	CVE-2020-25221	https://nvd.nist.gov/vuln/detail/CVE-2020-25221

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-672	https://cwe.mitre.org/data/definitions/672.html

ベンダー情報

No	Name	URL
ChangeLog
1	ChangeLog-5.8.7	https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7
Linux Kernel
2	Linux Kernel Archives	http://www.kernel.org
Linux kernel source tree
3	mm: fix pin vs. gup mismatch with gate pages	https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2
4	selftests/x86/test_vsyscall: Improve the process_vm_readv() test	https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a

その他

No	Name	URL
関連文書
1	CVE Request: Linux kernel vsyscall page refcounting error	https://www.openwall.com/lists/oss-security/2020/09/08/4

Change Log

No	Changed Details	Date of change
1	[2021年03月03日] 掲載	March 3, 2021, 11:41 a.m.