Vulnerability Details : CVE-2020-25656
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.
Vulnerability category: Memory Corruption
Products affected by CVE-2020-25656
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.10:rc1:*:*:*:*:*:*
- cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8:build12533:*:*:*:vsphere:*:*
- cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8:build12658:*:*:*:vsphere:*:*
- cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8:build12859:*:*:*:vsphere:*:*
- cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8:build13170:*:*:*:vsphere:*:*
- cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8:build13586:*:*:*:vsphere:*:*
- cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8:build13861:*:*:*:vsphere:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-25656
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 19 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-25656
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
1.9
|
LOW | AV:L/AC:M/Au:N/C:P/I:N/A:N |
3.4
|
2.9
|
NIST | |
|
4.1
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N |
0.5
|
3.6
|
NIST |
CWE ids for CVE-2020-25656
-
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
References for CVE-2020-25656
-
https://lkml.org/lkml/2020/10/16/84
LKML: Jiri Slaby: Re: [oss-security] CVE-2020-25656: Linux kernel concurrency UAF in vt_do_kdgkb_ioctlExploit;Mailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
[SECURITY] [DLA 2494-1] linux security updateMailing List;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1888726
1888726 – (CVE-2020-25656) CVE-2020-25656 kernel: use-after-free in read in vt_do_kdgkb_ioctlExploit;Issue Tracking;Patch;Third Party Advisory
-
https://www.starwindsoftware.com/security/sw-20210325-0006/
CVE-2020-25656 Linux Kernel vulnerability in StarWind VSAN for vSphere (VSA)Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
[SECURITY] [DLA 2483-1] linux-4.19 security updateMailing List;Third Party Advisory
-
https://lkml.org/lkml/2020/10/29/528
LKML: Jiri Slaby: [PATCH 11/17] vt: keyboard, reorder user buffer handling in vt_do_kdgkb_ioctlMailing List;Patch;Third Party Advisory
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