CVE-2020-8834
"KVM Linux Power8 Stack Corruption Panic Vulnerability"
Description
KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 ("KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures") 87a11bb6a7f7 ("KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 ("KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()") 7b0e827c6970 ("KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm") 009c872a8bc4 ("KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file")
INFO
Published Date :
April 9, 2020, 10:15 p.m.
Last Modified :
Oct. 7, 2022, 3:43 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
2.0
Public PoC/Exploit Available at Github
CVE-2020-8834 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2020-8834
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-8834.
| URL | Resource |
|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html | Mailing List Third Party Advisory |
| https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717 | Exploit Third Party Advisory |
| https://usn.ubuntu.com/4318-1/ | Third Party Advisory |
| https://usn.ubuntu.com/usn/usn-4318-1 | Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2020/04/06/2 | Mailing List Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Map Vulnerabilities into Different Layers of the Container Image
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-8834 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-8834 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Oct. 07, 2022
Action Type Old Value New Value Changed Reference Type http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html No Types Assigned http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Apr. 23, 2020
Action Type Old Value New Value Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html [No Types Assigned] -
Reanalysis by [email protected]
Apr. 17, 2020
Action Type Old Value New Value Removed CVSS V2 NIST (AV:L/AC:M/Au:N/C:N/I:N/A:C) Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:N/I:N/A:C) Removed CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H -
Initial Analysis by [email protected]
Apr. 15, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:M/Au:N/C:N/I:N/A:C) Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H Changed Reference Type https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717 No Types Assigned https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867717 Exploit, Third Party Advisory Changed Reference Type https://usn.ubuntu.com/4318-1/ No Types Assigned https://usn.ubuntu.com/4318-1/ Third Party Advisory Changed Reference Type https://usn.ubuntu.com/usn/usn-4318-1 No Types Assigned https://usn.ubuntu.com/usn/usn-4318-1 Third Party Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2020/04/06/2 No Types Assigned https://www.openwall.com/lists/oss-security/2020/04/06/2 Mailing List, Third Party Advisory Added CWE NIST CWE-362 Added CPE Configuration AND OR *cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* OR cpe:2.3:h:ibm:power8:-:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* -
CVE Modified by [email protected]
Apr. 15, 2020
Action Type Old Value New Value Added Reference https://usn.ubuntu.com/4318-1/ [No Types Assigned] -
CVE Modified by [email protected]
Apr. 09, 2020
Action Type Old Value New Value Changed Description KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 ("KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures") 87a11bb6a7f7 ("KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 ("KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()") 7b0e827c6970 ("KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm") 009c872a8bc4 ("KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file") KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 ("KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures") 87a11bb6a7f7 ("KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 ("KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()") 7b0e827c6970 ("KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm") 009c872a8bc4 ("KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file")
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-8834 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-8834
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} 0.00%
score
0.20668
percentile