Home/CVE/A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EF
CVE

CVE-2017-7518

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EF

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.

MEDIUM · CVSS 5.5 EPSS 0.0009
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0

Affected Products & Versions

9

Scoring & Timeline

5.5
MEDIUM · CVSS v3.0 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD30 Jul 2018 · 03:29 PM
CVSS VectorCVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Vendor Advisories

9
suse-csafSUSE-SU-2017:2956-1
suse-csafSUSE-SU-2017:2920-1
🔗

References & Sources

10
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2017/06/23/5Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/99263Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038782Third Party AdvisoryVDB Entry
https://access.redhat.com/articles/3290921Permissions RequiredThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518Issue TrackingPatchThird Party Advisory
https://usn.ubuntu.com/3619-1/Third Party Advisory
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