Resource exhaustion in Xen
CVE-2018-7540
An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (34.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Xen
- Debian Linux — versions 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- xenbits.xen.org/xsa/advisory-252.html (Vendor Advisory)
- security.gentoo.org/glsa/201810-06 (vendor-advisory)
- www.securitytracker.com/id/1040773 (vdb-entry)
- lists.debian.org/debian-lts-announce/2018/11/msg00013.html (mailing-list)
- lists.debian.org/debian-lts-announce/2018/03/msg00003.html (mailing-list, Third Party Advisory)
- www.securityfocus.com/bid/103174 (vdb-entry)
- www.debian.org/security/2018/dsa-4131 (vendor-advisory, Third Party Advisory)
- support.citrix.com/article/CTX232655
- support.citrix.com/article/CTX232096
Frequently asked questions
- What is CVE-2018-7540?
- CVE-2018-7540 is a medium-severity vulnerability in Xen, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2018-02-27.
- How severe is CVE-2018-7540?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2018-7540 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.