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CVE-2018-15594

21
FAUCET Score

CVE-2018-15594 is a medium-severity vulnerability in the Linux kernel (before 4.18.1) affecting paravirtual guests, including various Debian and Ubuntu distributions. It involves a flaw in arch/x86/kernel/paravirt.c that facilitates Spectre-v2 attacks, allowing attackers to potentially disclose sensitive information (CWE-200). The vulnerability has a CVSS score of 5.5 (Medium) with a local attack vector and low attack complexity, requiring low privileges and no user interaction. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0055 is in the 93rd percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt-0:3.10.0-1062.rt56.1022.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-1062.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-alt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: realtime-kernel

Vendor Advisories (1)

redhatCVE-2018-15594Moderate

kernel: Mishandling of indirect calls weakens Spectre mitigation for paravirtual guests

Aug 3, 2018

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
MitigationPatchVendor Advisory
lists.opensuse.org / opensuse-security-announce/2019-05/msg00043.html
access.redhat.com / errata/RHSA-2019:2029
access.redhat.com / errata/RHSA-2019:2043
cdn.kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.18.1
Release NotesVendor Advisory
github.com / torvalds/linux/commit/5800dc5c19f34e6e03b5adab1282535cb102fafd
MitigationPatchThird Party Advisory
lists.debian.org / debian-lts-announce/2018/10/msg00003.html
Mailing ListThird Party Advisory
twitter.com / grsecurity/status/1029324426142199808
Third Party Advisory
usn.ubuntu.com / 3775-1
Third Party Advisory
usn.ubuntu.com / 3775-2
Third Party Advisory
usn.ubuntu.com / 3776-1
Third Party Advisory
usn.ubuntu.com / 3776-2
Third Party Advisory
usn.ubuntu.com / 3777-1
Third Party Advisory
usn.ubuntu.com / 3777-2
Third Party Advisory
usn.ubuntu.com / 3777-3
Third Party Advisory
debian.org / security/2018/dsa-4308
Third Party Advisory
securityfocus.com / bid/105120
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041601
Third Party AdvisoryVDB Entry