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CVE-2020-8834

Status Candidate

Overview

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")

Related Files

Red Hat Security Advisory 2020-2854-01
Posted Jul 7, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-2854-01 - The kernel-alt packages provide the Linux kernel version 4.x. Issues addressed include denial of service, memory leak, out of bounds write, privilege escalation, and use-after-free vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability, memory leak
systems | linux, redhat
advisories | CVE-2018-16884, CVE-2019-11811, CVE-2019-15917, CVE-2019-18808, CVE-2019-19062, CVE-2019-19767, CVE-2019-20636, CVE-2019-9458, CVE-2020-10720, CVE-2020-11565, CVE-2020-12888, CVE-2020-8834
MD5 | 9aa7fb6ae4c123147a93204fd3d4c120
Ubuntu Security Notice USN-4318-1
Posted Apr 7, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4318-1 - Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information. Gustavo Romero and Paul Mackerras discovered that the KVM implementation in the Linux kernel for PowerPC processors did not properly keep guest state separate from host state. A local attacker in a KVM guest could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-8428, CVE-2020-8834, CVE-2020-8992
MD5 | 5e48818ed2a36a0661bea51765c36cec
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