CVE-2018-3640

CVE-2018-3640 is a medium-severity vulnerability in Intel Atom C with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.

Key facts

• Severity: Medium (CVSS 3.x base score 5.6)
• CVSS v2: 4.7
• EPSS exploit prediction: 8% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-203
• Affected product: Intel Atom C
• Published: 2018-05-22
• Last modified: 2026-06-17

Description

Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized disclosure of system parameters to an attacker with local user access via a side-channel analysis, aka Rogue System Register Read (RSRE), Variant 3a.

Frequently asked questions

What is CVE-2018-3640?

Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized disclosure of system parameters to an attacker with local user access via a side-channel analysis, aka Rogue System Register Read (RSRE), Variant 3a.

How severe is CVE-2018-3640?

CVE-2018-3640 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-3640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-3640?

CVE-2018-3640 primarily affects Intel Atom C. In total, 500 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-3640?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-3640 published?

CVE-2018-3640 was published on 2018-05-22 and last updated on 2026-06-17.

References

• http://support.lenovo.com/us/en/solutions/LEN-22133
• http://www.fujitsu.com/global/support/products/software/security/products-f/cve-2018-3639e.html
• http://www.securityfocus.com/bid/104228
• http://www.securitytracker.com/id/1040949
• http://www.securitytracker.com/id/1042004
• https://cert-portal.siemens.com/productcert/pdf/ssa-268644.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf
• https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability
• https://lists.debian.org/debian-lts-announce/2018/07/msg00038.html
• https://lists.debian.org/debian-lts-announce/2018/09/msg00017.html
• https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV180013
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0005
• https://security.netapp.com/advisory/ntap-20180521-0001/
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03850en_us
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180521-cpusidechannel
• https://usn.ubuntu.com/3756-1/
• https://www.debian.org/security/2018/dsa-4273
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html
• https://www.kb.cert.org/vuls/id/180049
• https://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-18-0006
• https://www.synology.com/support/security/Synology_SA_18_23
• https://www.us-cert.gov/ncas/alerts/TA18-141A

Affected products (500)

• cpe:2.3:h:intel:atom_c:c2308:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3308:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3338:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3508:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3538:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3558:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3708:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3750:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3758:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3808:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3830:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3850:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3858:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3950:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3955:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_c:c3958:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_e:e3805:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_e:e3815:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_e:e3825:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_e:e3826:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_e:e3827:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_e:e3845:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2420:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2460:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2480:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2520:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2560:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2580:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z2760:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3460:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3480:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3530:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3560:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3570:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3580:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3590:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3735d:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3735e:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3735f:*:*:*:*:*:*:*
• cpe:2.3:h:intel:atom_z:z3735g:*:*:*:*:*:*:*

More vulnerabilities in Intel Atom C

• CVE-2018-3652 — High (CVSS 7.6): Existing UEFI setting restrictions for DCI (Direct Connect Interface) in 5th and 6th generation Intel Xeon Processor E3…
• CVE-2018-3693 — Medium (CVSS 5.6): Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of…
• CVE-2018-9056 — Medium (CVSS 5.6): Systems with microprocessors utilizing speculative execution may allow unauthorized disclosure of information to an…
• CVE-2017-5754 — Medium (CVSS 5.6): Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized…
• CVE-2017-5753 — Medium (CVSS 5.6): Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of…
• CVE-2017-5715 — Medium (CVSS 5.6): Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized…

All CVEs affecting Intel Atom C →

Other CWE-203 (Observable Discrepancy) vulnerabilities

• CVE-2019-25337 — Critical (CVSS 9.8): OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by…
• CVE-2026-23519 — Critical (CVSS 9.8): RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in…
• CVE-2025-27667 — Critical (CVSS 9.8): Vasion Print (formerly PrinterLogic) before Virtual Appliance Host 22.0.843 Application 20.0.1923 allows Administrative…
• CVE-2024-25714 — Critical (CVSS 9.8): In Rhonabwy through 1.1.13, HMAC signature verification uses a strcmp function that is vulnerable to side-channel…
• CVE-2024-25191 — Critical (CVSS 9.8): php-jwt 1.0.0 uses strcmp (which is not constant time) to verify authentication, which makes it easier to bypass…
• CVE-2024-25190 — Critical (CVSS 9.8): l8w8jwt 2.2.1 uses memcmp (which is not constant time) to verify authentication, which makes it easier to bypass…

Browse all CWE-203 (Observable Discrepancy) vulnerabilities →