CVE-2018-10901
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.52% probability · 43th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-665
- Affected
- linux/linux kernel · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux workstation
- Source
- secalert@redhat.com
References
- http://www.securityfocus.com/bid/104905Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2390Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2391Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2392Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2393Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2394Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10901Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3444d7da1839b851eefedd372978d8a982316c36Patch, Vendor Advisory
- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/104905Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2390Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2391Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2392Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2393Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2394Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10901Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3444d7da1839b851eefedd372978d8a982316c36Patch, Vendor Advisory
- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.