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CVE-2020-8834
CVE ID
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CVE-2020-8834
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hventry 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”)
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CVSS V3 Severity and Metrics
General Information
Vendors
- canonical,
- linux,
- opensuse
Products
- leap 15.1,
- linux kernel -,
- ubuntu linux 16.04,
- ubuntu linux 18.04
References
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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