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CVE-2020-25656

nvd nist
Published: Dec 2, 2020Modified: Jun 17, 2026

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4.1
Vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Exploitability: 0.5 / Impact: 3.6
Source: NVD

Description

A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of bounds. The highest threat from this vulnerability is to data confidentiality.

Affected (11)

Show all products
Linux: Linux Kernel · Redhat: Enterprise Linux · Debian: Debian Linux · Starwindsoftware: Starwind Virtual San
Linux
1 product
Linux Kernel
Redhat
1 product
Enterprise Linux
Debian
1 product
Debian Linux
Starwindsoftware
1 product
Starwind Virtual San
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Linux
Linux Kernel
Before 5.10
Linux Kernel
Version 5.10 rc1
Configuration B
2 vulnerable
Vulnerable SoftwareAffected Versions
Redhat
Enterprise Linux
Version 7.0
Enterprise Linux
Version 8.0
Configuration C
1 vulnerable
Vulnerable SoftwareAffected Versions
Debian Linux
Version 9.0
Configuration D
6 vulnerable
Vulnerable SoftwareAffected Versions
Starwindsoftware
Starwind Virtual San
Version v8 build12533
Starwind Virtual San
Version v8 build12658
Starwind Virtual San
Version v8 build12859
Starwind Virtual San
Version v8 build13170
Starwind Virtual San
Version v8 build13586
Starwind Virtual San
Version v8 build13861

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (12)

Source: secalert@redhat.com
ExploitIssue TrackingPatchThird Party Advisory
Source: secalert@redhat.com
Mailing ListThird Party Advisory
Source: secalert@redhat.com
Mailing ListThird Party Advisory
Source: secalert@redhat.com
ExploitMailing ListThird Party Advisory
Source: secalert@redhat.com
Mailing ListPatchThird Party Advisory
Source: secalert@redhat.com
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitIssue TrackingPatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitMailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListPatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

Timeline

No history available yet.