CVE-2020-25221

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

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.

References

http://www.openwall.com/lists/oss-security/2020/09/10/4

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7

https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a

https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2

https://security.netapp.com/advisory/ntap-20201001-0003/

https://www.openwall.com/lists/oss-security/2020/09/08/4

Details

Source: MITRE

Published: 2020-09-10

Updated: 2020-10-01

Type: CWE-672

Risk Information

CVSS v2

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3

Base Score: 7.8

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

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Tenable Plugins

View all (1 total)

IDNameProductFamilySeverity
140328EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2020-1958)NessusHuawei Local Security Checks
high