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CVE-2018-3640

25
FAUCET Score

CVE-2018-3640, also known as Rogue System Register Read (RSRE) or Variant 3a, is a speculative execution side-channel vulnerability affecting microprocessors from Intel and ARM. It allows a local attacker to potentially disclose sensitive system parameters. The vulnerability has a CVSS score of 5.6 (MEDIUM), indicating a low-privileged local attacker with high attack complexity could achieve high confidentiality impact. While there is no known active exploitation, public exploit code, or Metasploit/Nuclei modules, the vulnerability has garnered significant community discussion and media coverage, suggesting considerable interest.

Impacted Technologies

VendorProductVersion(s)CPE
c2308CPE matchmatch criteria
cpe:2.3:h:intel:atom_c:c2308:*:*:*:*:*:*:*
c3308CPE matchmatch criteria
cpe:2.3:h:intel:atom_c:c3308:*:*:*:*:*:*:*
c3338CPE matchmatch criteria
cpe:2.3:h:intel:atom_c:c3338:*:*:*:*:*:*:*
c3508CPE matchmatch criteria
cpe:2.3:h:intel:atom_c:c3508:*:*:*:*:*:*:*
c3538CPE matchmatch criteria
cpe:2.3:h:intel:atom_c:c3538:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.6MEDIUM

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.1
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
7.56%
Probability of exploitation in next 30 days
EPSS Percentile
93.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0756 is in the 99th percentile among its peer group of 1,296 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

microsoftpatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2018-3640Moderate

hw: cpu: speculative register load

May 21, 2018

References

cert-portal.siemens.com / productcert/pdf/ssa-268644.pdf
cert-portal.siemens.com / productcert/pdf/ssa-608355.pdf
developer.arm.com / support/arm-security-updates/speculative-processor-vulnerability
Vendor Advisory
lists.debian.org / debian-lts-announce/2018/07/msg00038.html
lists.debian.org / debian-lts-announce/2018/09/msg00017.html
portal.msrc.microsoft.com / en-us/security-guidance/advisory/ADV180013
PatchThird Party AdvisoryVendor Advisory
psirt.global.sonicwall.com / vuln-detail/SNWLID-2018-0005
security.netapp.com / advisory/ntap-20180521-0001
Third Party Advisory
support.hpe.com / hpsc/doc/public/display
Third Party Advisory
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20180521-cpusidechannel
Third Party Advisory
support.lenovo.com / us/en/solutions/LEN-22133
Third Party Advisory
usn.ubuntu.com / 3756-1
debian.org / security/2018/dsa-4273
intel.com / content/www/us/en/security-center/advisory/intel-sa-00115.html
Vendor Advisory
kb.cert.org / vuls/id/180049
Third Party AdvisoryUS Government Resource
mitel.com / en-ca/support/security-advisories/mitel-product-security-advisory-18-0006
synology.com / support/security/Synology_SA_18_23
Third Party Advisory
us-cert.gov / ncas/alerts/TA18-141A
Third Party AdvisoryUS Government Resource
fujitsu.com / global/support/products/software/security/products-f/cve-2018-3639e.html
Third Party Advisory
securityfocus.com / bid/104228
Third Party AdvisoryVDB Entry
securitytracker.com / id/1040949
Third Party AdvisoryVDB Entry
securitytracker.com / id/1042004