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Race Condition The advisory has been revoked - it doesn't affect any version of package kselftests-kmp-rt_debug  (opens in a new tab)

Threat Intelligence

EPSS
0.35% (27th percentile)

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  • Snyk IDSNYK-SLES151-KSELFTESTSKMPRTDEBUG-2713595
  • published14 Apr 2022
  • disclosed28 Apr 2020
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Introduced: 28 Apr 2020

CVE-2020-8834  (opens in a new tab)
CWE-362  (opens in a new tab)

Amendment

The SLES security team deemed this advisory irrelevant for SLES:15.1.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kselftests-kmp-rt_debug package and not the kselftests-kmp-rt_debug package as distributed by SLES.

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")

References