CVE-2018-15594

Published: 20 August 2018

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.

From the Ubuntu security team

It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information.

Priority

High

CVSS 3 base score: 5.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15594
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5800dc5c19f34e6e03b5adab1282535cb102fafd
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1
• https://github.com/torvalds/linux/commit/5800dc5c19f34e6e03b5adab1282535cb102fafd
• https://twitter.com/grsecurity/status/1029324426142199808
• https://ubuntu.com/security/notices/USN-3775-1
• https://ubuntu.com/security/notices/USN-3775-2
• https://ubuntu.com/security/notices/USN-3776-1
• https://ubuntu.com/security/notices/USN-3776-2
• https://ubuntu.com/security/notices/USN-3777-1
• https://ubuntu.com/security/notices/USN-3777-2
• https://ubuntu.com/security/notices/USN-3777-3
• NVD
• Launchpad
• Debian

Bugs