CVE-2018-10901

Summary

A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.

Affected Software

Weaknesses

• CWE-665: CWE-665

ADP Enrichment

CVE Program Container

Additional References

• http://www.securityfocus.com/bid/104905
• https://access.redhat.com/errata/RHSA-2018:2393
• https://access.redhat.com/errata/RHSA-2018:2390
• https://access.redhat.com/errata/RHSA-2018:2391
• https://access.redhat.com/errata/RHSA-2018:2392
• https://access.redhat.com/errata/RHSA-2018:2394
• https://www.oracle.com/security-alerts/cpujul2020.html
• https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
• https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3444d7da1839b851eefedd372978d8a982316c36
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10901

References

• http://www.securityfocus.com/bid/104905
• https://access.redhat.com/errata/RHSA-2018:2393
• https://access.redhat.com/errata/RHSA-2018:2390
• https://access.redhat.com/errata/RHSA-2018:2391
• https://access.redhat.com/errata/RHSA-2018:2392
• https://access.redhat.com/errata/RHSA-2018:2394
• https://www.oracle.com/security-alerts/cpujul2020.html
• https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
• https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3444d7da1839b851eefedd372978d8a982316c36
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10901

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