An issue was discovered in drivers/xen/balloon.c in the Linux kernel before 5.2.3, as used in Xen through 4.12.x, allowing guest OS users to cause a denial of service because of unrestricted resource consumption during the mapping of guest memory, aka CID-6ef36ab967c7.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-17351
• torvalds/linux@6ef36ab
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.3
• https://security.netapp.com/advisory/ntap-20191031-0005/
• https://usn.ubuntu.com/4286-1/
• https://usn.ubuntu.com/4286-2/
• https://xenbits.xen.org/xsa/advisory-300.html
• http://www.openwall.com/lists/oss-security/2019/10/25/9
• http://xenbits.xen.org/xsa/advisory-300.html