CVE-2018-3646

Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access with guest OS privilege via a terminal page fault and a side-channel analysis.

Published: 2018-08-14 Last update: 2026-05-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-3646 is rated Moderate Risk (51/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.53%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-3646

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-30 3.88% 2.53% -1.35%
2 2026-04-26 3.98% 3.88% -0.10%
3 2026-04-21 — 3.98% —

Full EPSS history (51 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-3646

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.6 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.1 4.0 134c704f-9b21-4f2e-91b3-4a467353bcc0
5.6 3.0 MEDIUM
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.1 4.0 [email protected]
4.7 2.0 MEDIUM
AV:L/AC:M/Au:N/C:C/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.4 6.9 [email protected]

Weakness enumeration for CVE-2018-3646

GitHub Security Advisory for CVE-2018-3646

GHSA-qj7r-58vw-6www · Severity: medium — Systems with microprocessors utilizing speculative execution and address translations may allow...

OS Trackers for CVE-2018-3646

vendor priority summary link
alpine medium CVE-2018-3646: 1 source package rows (xen); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2018-3646
debian not yet assigned CVE-2018-3646 not yet assigned priority: Debian including 3 source packages (intel-microcode, linux, xen), 15 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 15. https://security-tracker.debian.org/tracker/CVE-2018-3646
gentoo normal CVE-2018-3646: 1 GLSA(s) (201810-06), 2 atom(s) (app-emulation/xen, app-emulation/xen-tools); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-3646
redhat high — https://access.redhat.com/security/cve/CVE-2018-3646
suse high CVE-2018-3646 severity important: SUSE including 744 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 1353 product×package rows across 120 product lines (SUSE CaaS Platform 3.0, SUSE CaaS Platform 4.0, … (120 product lines)): Fixed 912, Known Not Affected 284, Known Affected 157. https://www.suse.com/security/cve/CVE-2018-3646/
ubuntu high CVE-2018-3646 high priority: Ubuntu including 79 source packages (intel-microcode, linux, …), 640 status rows across 10 suites (bionic, cosmic, disco, focal, jammy, noble, oracular, trusty, upstream, xenial): DNE 398, not-affected 138, released 92, ignored 11, needed 1. https://ubuntu.com/security/CVE-2018-3646

Affected software / configurations for CVE-2018-3646

Vendor Product Version Raw CPE
intel core_i3 330e cpe:2.3:h:intel:core_i3:330e:*:*:*:*:*:*:*
intel core_i3 330m cpe:2.3:h:intel:core_i3:330m:*:*:*:*:*:*:*
intel core_i3 330um cpe:2.3:h:intel:core_i3:330um:*:*:*:*:*:*:*
intel core_i3 350m cpe:2.3:h:intel:core_i3:350m:*:*:*:*:*:*:*
intel core_i3 370m cpe:2.3:h:intel:core_i3:370m:*:*:*:*:*:*:*
intel core_i3 380m cpe:2.3:h:intel:core_i3:380m:*:*:*:*:*:*:*
intel core_i3 380um cpe:2.3:h:intel:core_i3:380um:*:*:*:*:*:*:*
intel core_i3 390m cpe:2.3:h:intel:core_i3:390m:*:*:*:*:*:*:*
intel core_i3 530 cpe:2.3:h:intel:core_i3:530:*:*:*:*:*:*:*
intel core_i3 540 cpe:2.3:h:intel:core_i3:540:*:*:*:*:*:*:*
intel core_i3 550 cpe:2.3:h:intel:core_i3:550:*:*:*:*:*:*:*
intel core_i3 560 cpe:2.3:h:intel:core_i3:560:*:*:*:*:*:*:*
intel core_i3 2100 cpe:2.3:h:intel:core_i3:2100:*:*:*:*:*:*:*
intel core_i3 2100t cpe:2.3:h:intel:core_i3:2100t:*:*:*:*:*:*:*
intel core_i3 2102 cpe:2.3:h:intel:core_i3:2102:*:*:*:*:*:*:*
intel core_i3 2105 cpe:2.3:h:intel:core_i3:2105:*:*:*:*:*:*:*
intel core_i3 2115c cpe:2.3:h:intel:core_i3:2115c:*:*:*:*:*:*:*
intel core_i3 2120 cpe:2.3:h:intel:core_i3:2120:*:*:*:*:*:*:*
intel core_i3 2120t cpe:2.3:h:intel:core_i3:2120t:*:*:*:*:*:*:*
intel core_i3 2125 cpe:2.3:h:intel:core_i3:2125:*:*:*:*:*:*:*
intel core_i3 2130 cpe:2.3:h:intel:core_i3:2130:*:*:*:*:*:*:*
intel core_i3 2310e cpe:2.3:h:intel:core_i3:2310e:*:*:*:*:*:*:*
intel core_i3 2310m cpe:2.3:h:intel:core_i3:2310m:*:*:*:*:*:*:*
intel core_i3 2312m cpe:2.3:h:intel:core_i3:2312m:*:*:*:*:*:*:*
intel core_i3 2328m cpe:2.3:h:intel:core_i3:2328m:*:*:*:*:*:*:*
intel core_i3 2330e cpe:2.3:h:intel:core_i3:2330e:*:*:*:*:*:*:*
intel core_i3 2330m cpe:2.3:h:intel:core_i3:2330m:*:*:*:*:*:*:*
intel core_i3 2340ue cpe:2.3:h:intel:core_i3:2340ue:*:*:*:*:*:*:*
intel core_i3 2348m cpe:2.3:h:intel:core_i3:2348m:*:*:*:*:*:*:*
intel core_i3 2350m cpe:2.3:h:intel:core_i3:2350m:*:*:*:*:*:*:*
intel core_i3 2357m cpe:2.3:h:intel:core_i3:2357m:*:*:*:*:*:*:*
intel core_i3 2365m cpe:2.3:h:intel:core_i3:2365m:*:*:*:*:*:*:*
intel core_i3 2367m cpe:2.3:h:intel:core_i3:2367m:*:*:*:*:*:*:*
intel core_i3 2370m cpe:2.3:h:intel:core_i3:2370m:*:*:*:*:*:*:*
intel core_i3 2375m cpe:2.3:h:intel:core_i3:2375m:*:*:*:*:*:*:*
intel core_i3 2377m cpe:2.3:h:intel:core_i3:2377m:*:*:*:*:*:*:*
intel core_i3 3110m cpe:2.3:h:intel:core_i3:3110m:*:*:*:*:*:*:*
intel core_i3 3115c cpe:2.3:h:intel:core_i3:3115c:*:*:*:*:*:*:*
intel core_i3 3120m cpe:2.3:h:intel:core_i3:3120m:*:*:*:*:*:*:*
intel core_i3 3120me cpe:2.3:h:intel:core_i3:3120me:*:*:*:*:*:*:*
intel core_i3 3130m cpe:2.3:h:intel:core_i3:3130m:*:*:*:*:*:*:*
intel core_i3 3210 cpe:2.3:h:intel:core_i3:3210:*:*:*:*:*:*:*
intel core_i3 3217u cpe:2.3:h:intel:core_i3:3217u:*:*:*:*:*:*:*
intel core_i3 3217ue cpe:2.3:h:intel:core_i3:3217ue:*:*:*:*:*:*:*
intel core_i3 3220 cpe:2.3:h:intel:core_i3:3220:*:*:*:*:*:*:*
intel core_i3 3220t cpe:2.3:h:intel:core_i3:3220t:*:*:*:*:*:*:*
intel core_i3 3225 cpe:2.3:h:intel:core_i3:3225:*:*:*:*:*:*:*
intel core_i3 3227u cpe:2.3:h:intel:core_i3:3227u:*:*:*:*:*:*:*
intel core_i3 3229y cpe:2.3:h:intel:core_i3:3229y:*:*:*:*:*:*:*
intel core_i3 3240 cpe:2.3:h:intel:core_i3:3240:*:*:*:*:*:*:*
intel core_i3 3240t cpe:2.3:h:intel:core_i3:3240t:*:*:*:*:*:*:*
intel core_i3 3245 cpe:2.3:h:intel:core_i3:3245:*:*:*:*:*:*:*
intel core_i3 3250 cpe:2.3:h:intel:core_i3:3250:*:*:*:*:*:*:*
intel core_i3 3250t cpe:2.3:h:intel:core_i3:3250t:*:*:*:*:*:*:*
intel core_i3 4000m cpe:2.3:h:intel:core_i3:4000m:*:*:*:*:*:*:*
intel core_i3 4005u cpe:2.3:h:intel:core_i3:4005u:*:*:*:*:*:*:*
intel core_i3 4010u cpe:2.3:h:intel:core_i3:4010u:*:*:*:*:*:*:*
intel core_i3 4010y cpe:2.3:h:intel:core_i3:4010y:*:*:*:*:*:*:*
intel core_i3 4012y cpe:2.3:h:intel:core_i3:4012y:*:*:*:*:*:*:*
intel core_i3 4020y cpe:2.3:h:intel:core_i3:4020y:*:*:*:*:*:*:*
intel core_i3 4025u cpe:2.3:h:intel:core_i3:4025u:*:*:*:*:*:*:*
intel core_i3 4030u cpe:2.3:h:intel:core_i3:4030u:*:*:*:*:*:*:*
intel core_i3 4030y cpe:2.3:h:intel:core_i3:4030y:*:*:*:*:*:*:*
intel core_i3 4100e cpe:2.3:h:intel:core_i3:4100e:*:*:*:*:*:*:*
intel core_i3 4100m cpe:2.3:h:intel:core_i3:4100m:*:*:*:*:*:*:*
intel core_i3 4100u cpe:2.3:h:intel:core_i3:4100u:*:*:*:*:*:*:*
intel core_i3 4102e cpe:2.3:h:intel:core_i3:4102e:*:*:*:*:*:*:*
intel core_i3 4110e cpe:2.3:h:intel:core_i3:4110e:*:*:*:*:*:*:*
intel core_i3 4110m cpe:2.3:h:intel:core_i3:4110m:*:*:*:*:*:*:*
intel core_i3 4112e cpe:2.3:h:intel:core_i3:4112e:*:*:*:*:*:*:*
intel core_i3 4120u cpe:2.3:h:intel:core_i3:4120u:*:*:*:*:*:*:*
intel core_i3 4130 cpe:2.3:h:intel:core_i3:4130:*:*:*:*:*:*:*
intel core_i3 4130t cpe:2.3:h:intel:core_i3:4130t:*:*:*:*:*:*:*
intel core_i3 4150 cpe:2.3:h:intel:core_i3:4150:*:*:*:*:*:*:*
intel core_i3 4150t cpe:2.3:h:intel:core_i3:4150t:*:*:*:*:*:*:*
intel core_i3 4158u cpe:2.3:h:intel:core_i3:4158u:*:*:*:*:*:*:*
intel core_i3 4160 cpe:2.3:h:intel:core_i3:4160:*:*:*:*:*:*:*
intel core_i3 4160t cpe:2.3:h:intel:core_i3:4160t:*:*:*:*:*:*:*
intel core_i3 4170 cpe:2.3:h:intel:core_i3:4170:*:*:*:*:*:*:*
intel core_i3 4170t cpe:2.3:h:intel:core_i3:4170t:*:*:*:*:*:*:*

References for CVE-2018-3646

URL Tags
http://support.lenovo.com/us/en/solutions/LEN-24163 Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20180815-01-cpu-en Third Party Advisory
http://www.securityfocus.com/bid/105080 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1041451 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1042004
http://www.vmware.com/security/advisories/VMSA-2018-0020.html Third Party Advisory
http://xenbits.xen.org/xsa/advisory-273.html Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2384 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2387 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2388 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2389 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2390 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2391 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2392 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2393 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2394 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2395 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2396 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2402 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2403 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2404 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2602
https://access.redhat.com/errata/RHSA-2018:2603
https://cert-portal.siemens.com/productcert/pdf/ssa-254686.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf
https://foreshadowattack.eu/ Technical Description Third Party Advisory
https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
https://lists.debian.org/debian-lts-announce/2018/08/msg00029.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00017.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4UWGORQWCENCIF2BHWUEF2ODBV75QS2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XRFKQWYV2H4BV75CUNGCGE5TNVQCLBGZ/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV180018
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0010 Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:09.l1tf.asc Third Party Advisory
https://security.gentoo.org/glsa/201810-06
https://security.netapp.com/advisory/ntap-20180815-0001/ Third Party Advisory
https://software.intel.com/security-software-guidance/software-guidance/l1-terminal-fault Mitigation Vendor Advisory
https://support.f5.com/csp/article/K31300402 Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03874en_us Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180814-cpusidechannel Third Party Advisory
https://usn.ubuntu.com/3740-1/ Third Party Advisory
https://usn.ubuntu.com/3740-2/ Third Party Advisory
https://usn.ubuntu.com/3741-1/ Third Party Advisory
https://usn.ubuntu.com/3741-2/
https://usn.ubuntu.com/3742-1/ Third Party Advisory
https://usn.ubuntu.com/3742-2/ Third Party Advisory
https://usn.ubuntu.com/3756-1/
https://usn.ubuntu.com/3823-1/
https://www.debian.org/security/2018/dsa-4274
https://www.debian.org/security/2018/dsa-4279
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00161.html Vendor Advisory
https://www.kb.cert.org/vuls/id/982149
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
https://www.synology.com/support/security/Synology_SA_18_45 Third Party Advisory
cvelogic Threat Intelligence