CVE-2018-1087

kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

Published: 2018-05-15 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-1087 is rated Moderate Risk (50.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.77%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-1087

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.04% 0.77% +0.73%
2 2025-11-21 0.07% 0.04% -0.03%
3 2025-11-18 — 0.07% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-1087

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.0 3.0 HIGH
CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.1 5.9 [email protected]
7.8 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2018-1087

OS Trackers for CVE-2018-1087

vendor priority summary link
debian not yet assigned CVE-2018-1087 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-1087
redhat high — https://access.redhat.com/security/cve/CVE-2018-1087
suse high CVE-2018-1087 severity important: SUSE including 140 source package names (kernel-3.10.0-862.2.3.el7, kernel-abi-whitelists-3.10.0-862.2.3.el7, …), 511 product×package rows across 57 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 4, … (57 product lines)): Known Not Affected 265, Fixed 246. https://www.suse.com/security/cve/CVE-2018-1087/
ubuntu high CVE-2018-1087 high priority: Ubuntu including 76 source packages (linux, linux-aws, …), 610 status rows across 10 suites (artful, bionic, cosmic, focal, jammy, noble, oracular, trusty, upstream, xenial): DNE 388, not-affected 123, released 90, ignored 9. https://ubuntu.com/security/CVE-2018-1087

Affected software / configurations for CVE-2018-1087

Vendor Product Version Raw CPE
linux linux_kernel 4.16 cpe:2.3:o:linux:linux_kernel:4.16:*:*:*:*:*:*:*
linux linux_kernel 4.16 cpe:2.3:o:linux:linux_kernel:4.16:rc7:*:*:*:*:*:*
linux linux_kernel 4.17 cpe:2.3:o:linux:linux_kernel:4.17:rc1:*:*:*:*:*:*
linux linux_kernel 4.17 cpe:2.3:o:linux:linux_kernel:4.17:rc2:*:*:*:*:*:*
linux linux_kernel 4.17 cpe:2.3:o:linux:linux_kernel:4.17:rc3:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 17.10 cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.2 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.5 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.2 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_virtualization 4.0 cpe:2.3:o:redhat:enterprise_linux_virtualization:4.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2018-1087

URL Tags
http://www.openwall.com/lists/oss-security/2018/05/08/5 Mailing List
http://www.securityfocus.com/bid/104127 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1040862 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:1318 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1345 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1347 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1348 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1355 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1524 Third Party Advisory
https://access.redhat.com/security/vulnerabilities/pop_ss Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1087 Issue Tracking
https://usn.ubuntu.com/3641-1/ Third Party Advisory
https://usn.ubuntu.com/3641-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4196 Third Party Advisory
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