MEDIUM
CVE-2018-20124
CWE-125Published: December 20, 2018· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official Description
hw/rdma/rdma_backend.c in QEMU allows guest OS users to trigger out-of-bounds access via a PvrdmaSqWqe ring element with a large num_sge value.
Technical Analysis
CVE-2018-20124 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttps://usn.ubuntu.com/3923-1/
ADVISORYhttps://usn.ubuntu.com/3923-1/
All References (8)
→
http://www.openwall.com/lists/oss-security/2018/12/18/2Mailing List · Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/106290Third Party Advisory · VDB Entry
→
https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02822.htmlPatch · Third Party Advisory
→
https://usn.ubuntu.com/3923-1/Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2018/12/18/2Mailing List · Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/106290Third Party Advisory · VDB Entry
→
https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02822.htmlPatch · Third Party Advisory
→
https://usn.ubuntu.com/3923-1/Third Party Advisory
Quick Facts
CVE IDCVE-2018-20124
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected2 vendor(s)
PublishedDec 20, 2018
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-20124 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.