What’s Vulnerable › Vulnerabilities

CVE-2018-15594

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-08-20 · updated 2026-06-17
• Weakness: CWE-200

Description

arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtual guests.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04
• Debian Linux: 8.0, 9.0
• Linux kernel: before 4.18.1 — fixed in 4.18.1

How to fix

Upgrade to a fixed version: Linux kernel 4.18.1. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5800dc5c19f34e6e03b5adab1282535cb102fafd
• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html
• http://www.securityfocus.com/bid/105120
• http://www.securitytracker.com/id/1041601
• https://access.redhat.com/errata/RHSA-2019:2029
• https://access.redhat.com/errata/RHSA-2019:2043
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1
• https://github.com/torvalds/linux/commit/5800dc5c19f34e6e03b5adab1282535cb102fafd
• https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
• https://twitter.com/grsecurity/status/1029324426142199808
• https://usn.ubuntu.com/3775-1/
• https://usn.ubuntu.com/3775-2/

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