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")
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Centos_linux | — | Upgrade kernel | Jul 8, 2020 | Apr 9, 2020 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Apr 9, 2020 |
| Redhat_linux | — | No solution existsUpgrade kernel | Jul 8, 2020 | Apr 9, 2020 |
| Suse | — | Upgrade kernel-default-extraUpgrade cluster-md-kmp-defaultUpgrade kernel-default-manUpgrade kernel-obs-buildUpgrade dlm-kmp-defaultUpgrade kernel-defaultUpgrade ocfs2-kmp-defaultUpgrade gfs2-kmp-defaultUpgrade kernel-azure-baseUpgrade kernel-docs | Apr 24, 2020 | Apr 6, 2020 |
| Ubuntu | — | Upgrade linux-image-genericUpgrade linux-image-lowlatency-hwe-16.04Upgrade linux-image-oemUpgrade linux-image-4.15.0-96-genericUpgrade linux-image-generic-hwe-16.04Upgrade linux-image-generic-lpaeUpgrade linux-image-4.15.0-96-lowlatencyUpgrade linux-image-4.15.0-96-generic-lpaeUpgrade linux-image-virtual-hwe-16.04Upgrade linux-image-lowlatencyUpgrade linux-image-virtualUpgrade linux-image-generic-lpae-hwe-16.04 | Apr 7, 2020 | Apr 6, 2020 |
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