CVE-2018-7540
xen - security update
6.5
MEDIUM
CVSS 3.1
EPSS 0.11%
Description
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.
How to fix CVE-2018-7540
To remediate CVE-2018-7540, upgrade the affected package to a fixed version below.
- Alpine/xen—upgrade to 4.10.0-r2 or later
- Debian/xen—upgrade to 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5 or later
- —upgrade to 4.1.6.lts1-13 or later
- —upgrade to 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5 or later
Is CVE-2018-7540 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 4.10.0-r2
- from 0, < 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5
- from 0, < 4.1.6.lts1-13
- from 0, < 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |