CVE-2020-25221 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.8 HIGH
Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2020/09/10/4 Third Party Advisory 
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 Release Notes  Vendor Advisory 
https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a Issue Tracking  Patch  Vendor Advisory 
https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 Issue Tracking  Patch  Vendor Advisory 
https://security.netapp.com/advisory/ntap-20201001-0003/
https://www.openwall.com/lists/oss-security/2020/09/08/4 Mailing List  Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-672 Operation on a Resource after Expiration or Release cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-25221
NVD Published Date:
09/10/2020
NVD Last Modified:
10/01/2020
Source:
MITRE