CVE-2005-0109

Hyper-Threading technology, as used in FreeBSD and other operating systems that are run on Intel Pentium and other processors, allows local users to use a malicious thread to create covert channels, monitor the execution of other threads, and obtain sensitive information such as cryptographic keys, via a timing attack on memory cache misses.

Published: 2005-03-05 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2005-0109 is rated Low Risk (33.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.14%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2005-0109

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 2025-03-30 0.35% 0.14% -0.21%
2 2025-03-29 0.07% 0.35% +0.27%
3 2023-03-07 — 0.07% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2005-0109

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
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-2005-0109

OS Trackers for CVE-2005-0109

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2005-0109
ubuntu medium CVE-2005-0109 medium priority: Ubuntu including 1 source packages (kfreebsd-5), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. https://ubuntu.com/security/CVE-2005-0109

Vendor comments (NVD) for CVE-2005-0109

  • Red Hat (2007-03-14T00:00:00)

    Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch.

Affected software / configurations for CVE-2005-0109

Vendor Product Version Raw CPE
freebsd freebsd 1.1.5.1 cpe:2.3:o:freebsd:freebsd:1.1.5.1:*:*:*:*:*:*:*
freebsd freebsd 2.0 cpe:2.3:o:freebsd:freebsd:2.0:*:*:*:*:*:*:*
freebsd freebsd 2.0.5 cpe:2.3:o:freebsd:freebsd:2.0.5:*:*:*:*:*:*:*
freebsd freebsd 2.1.0 cpe:2.3:o:freebsd:freebsd:2.1.0:*:*:*:*:*:*:*
freebsd freebsd 2.1.5 cpe:2.3:o:freebsd:freebsd:2.1.5:*:*:*:*:*:*:*
freebsd freebsd 2.1.6 cpe:2.3:o:freebsd:freebsd:2.1.6:*:*:*:*:*:*:*
freebsd freebsd 2.1.6.1 cpe:2.3:o:freebsd:freebsd:2.1.6.1:*:*:*:*:*:*:*
freebsd freebsd 2.1.7.1 cpe:2.3:o:freebsd:freebsd:2.1.7.1:*:*:*:*:*:*:*
freebsd freebsd 2.2 cpe:2.3:o:freebsd:freebsd:2.2:*:*:*:*:*:*:*
freebsd freebsd 2.2.2 cpe:2.3:o:freebsd:freebsd:2.2.2:*:*:*:*:*:*:*
freebsd freebsd 2.2.3 cpe:2.3:o:freebsd:freebsd:2.2.3:*:*:*:*:*:*:*
freebsd freebsd 2.2.4 cpe:2.3:o:freebsd:freebsd:2.2.4:*:*:*:*:*:*:*
freebsd freebsd 2.2.5 cpe:2.3:o:freebsd:freebsd:2.2.5:*:*:*:*:*:*:*
freebsd freebsd 2.2.6 cpe:2.3:o:freebsd:freebsd:2.2.6:*:*:*:*:*:*:*
freebsd freebsd 2.2.8 cpe:2.3:o:freebsd:freebsd:2.2.8:*:*:*:*:*:*:*
freebsd freebsd 3.0 cpe:2.3:o:freebsd:freebsd:3.0:*:*:*:*:*:*:*
freebsd freebsd 3.0 cpe:2.3:o:freebsd:freebsd:3.0:releng:*:*:*:*:*:*
freebsd freebsd 3.1 cpe:2.3:o:freebsd:freebsd:3.1:*:*:*:*:*:*:*
freebsd freebsd 3.2 cpe:2.3:o:freebsd:freebsd:3.2:*:*:*:*:*:*:*
freebsd freebsd 3.3 cpe:2.3:o:freebsd:freebsd:3.3:*:*:*:*:*:*:*
freebsd freebsd 3.4 cpe:2.3:o:freebsd:freebsd:3.4:*:*:*:*:*:*:*
freebsd freebsd 3.5 cpe:2.3:o:freebsd:freebsd:3.5:*:*:*:*:*:*:*
freebsd freebsd 3.5 cpe:2.3:o:freebsd:freebsd:3.5:stable:*:*:*:*:*:*
freebsd freebsd 3.5.1 cpe:2.3:o:freebsd:freebsd:3.5.1:*:*:*:*:*:*:*
freebsd freebsd 3.5.1 cpe:2.3:o:freebsd:freebsd:3.5.1:release:*:*:*:*:*:*
freebsd freebsd 3.5.1 cpe:2.3:o:freebsd:freebsd:3.5.1:stable:*:*:*:*:*:*
freebsd freebsd 4.0 cpe:2.3:o:freebsd:freebsd:4.0:*:*:*:*:*:*:*
freebsd freebsd 4.0 cpe:2.3:o:freebsd:freebsd:4.0:alpha:*:*:*:*:*:*
freebsd freebsd 4.0 cpe:2.3:o:freebsd:freebsd:4.0:releng:*:*:*:*:*:*
freebsd freebsd 4.1 cpe:2.3:o:freebsd:freebsd:4.1:*:*:*:*:*:*:*
freebsd freebsd 4.1.1 cpe:2.3:o:freebsd:freebsd:4.1.1:*:*:*:*:*:*:*
freebsd freebsd 4.1.1 cpe:2.3:o:freebsd:freebsd:4.1.1:release:*:*:*:*:*:*
freebsd freebsd 4.1.1 cpe:2.3:o:freebsd:freebsd:4.1.1:stable:*:*:*:*:*:*
freebsd freebsd 4.2 cpe:2.3:o:freebsd:freebsd:4.2:*:*:*:*:*:*:*
freebsd freebsd 4.2 cpe:2.3:o:freebsd:freebsd:4.2:stable:*:*:*:*:*:*
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:*:*:*:*:*:*:*
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:release:*:*:*:*:*:*
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:release_p38:*:*:*:*:*:*
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:releng:*:*:*:*:*:*
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:stable:*:*:*:*:*:*
freebsd freebsd 4.4 cpe:2.3:o:freebsd:freebsd:4.4:*:*:*:*:*:*:*
freebsd freebsd 4.4 cpe:2.3:o:freebsd:freebsd:4.4:release_p42:*:*:*:*:*:*
freebsd freebsd 4.4 cpe:2.3:o:freebsd:freebsd:4.4:releng:*:*:*:*:*:*
freebsd freebsd 4.4 cpe:2.3:o:freebsd:freebsd:4.4:stable:*:*:*:*:*:*
freebsd freebsd 4.5 cpe:2.3:o:freebsd:freebsd:4.5:*:*:*:*:*:*:*
freebsd freebsd 4.5 cpe:2.3:o:freebsd:freebsd:4.5:release:*:*:*:*:*:*
freebsd freebsd 4.5 cpe:2.3:o:freebsd:freebsd:4.5:release_p32:*:*:*:*:*:*
freebsd freebsd 4.5 cpe:2.3:o:freebsd:freebsd:4.5:releng:*:*:*:*:*:*
freebsd freebsd 4.5 cpe:2.3:o:freebsd:freebsd:4.5:stable:*:*:*:*:*:*
freebsd freebsd 4.6 cpe:2.3:o:freebsd:freebsd:4.6:*:*:*:*:*:*:*
freebsd freebsd 4.6 cpe:2.3:o:freebsd:freebsd:4.6:release:*:*:*:*:*:*
freebsd freebsd 4.6 cpe:2.3:o:freebsd:freebsd:4.6:release_p20:*:*:*:*:*:*
freebsd freebsd 4.6 cpe:2.3:o:freebsd:freebsd:4.6:releng:*:*:*:*:*:*
freebsd freebsd 4.6 cpe:2.3:o:freebsd:freebsd:4.6:stable:*:*:*:*:*:*
freebsd freebsd 4.6.2 cpe:2.3:o:freebsd:freebsd:4.6.2:*:*:*:*:*:*:*
freebsd freebsd 4.7 cpe:2.3:o:freebsd:freebsd:4.7:*:*:*:*:*:*:*
freebsd freebsd 4.7 cpe:2.3:o:freebsd:freebsd:4.7:release:*:*:*:*:*:*
freebsd freebsd 4.7 cpe:2.3:o:freebsd:freebsd:4.7:release_p17:*:*:*:*:*:*
freebsd freebsd 4.7 cpe:2.3:o:freebsd:freebsd:4.7:releng:*:*:*:*:*:*
freebsd freebsd 4.7 cpe:2.3:o:freebsd:freebsd:4.7:stable:*:*:*:*:*:*
freebsd freebsd 4.8 cpe:2.3:o:freebsd:freebsd:4.8:*:*:*:*:*:*:*
freebsd freebsd 4.8 cpe:2.3:o:freebsd:freebsd:4.8:pre-release:*:*:*:*:*:*
freebsd freebsd 4.8 cpe:2.3:o:freebsd:freebsd:4.8:release_p6:*:*:*:*:*:*
freebsd freebsd 4.8 cpe:2.3:o:freebsd:freebsd:4.8:releng:*:*:*:*:*:*
freebsd freebsd 4.9 cpe:2.3:o:freebsd:freebsd:4.9:*:*:*:*:*:*:*
freebsd freebsd 4.9 cpe:2.3:o:freebsd:freebsd:4.9:pre-release:*:*:*:*:*:*
freebsd freebsd 4.9 cpe:2.3:o:freebsd:freebsd:4.9:releng:*:*:*:*:*:*
freebsd freebsd 4.10 cpe:2.3:o:freebsd:freebsd:4.10:*:*:*:*:*:*:*
freebsd freebsd 4.10 cpe:2.3:o:freebsd:freebsd:4.10:release:*:*:*:*:*:*
freebsd freebsd 4.10 cpe:2.3:o:freebsd:freebsd:4.10:release_p8:*:*:*:*:*:*
freebsd freebsd 4.10 cpe:2.3:o:freebsd:freebsd:4.10:releng:*:*:*:*:*:*
freebsd freebsd 4.11 cpe:2.3:o:freebsd:freebsd:4.11:release_p3:*:*:*:*:*:*
freebsd freebsd 4.11 cpe:2.3:o:freebsd:freebsd:4.11:releng:*:*:*:*:*:*
freebsd freebsd 4.11 cpe:2.3:o:freebsd:freebsd:4.11:stable:*:*:*:*:*:*
freebsd freebsd 5.0 cpe:2.3:o:freebsd:freebsd:5.0:*:*:*:*:*:*:*
freebsd freebsd 5.0 cpe:2.3:o:freebsd:freebsd:5.0:alpha:*:*:*:*:*:*
freebsd freebsd 5.0 cpe:2.3:o:freebsd:freebsd:5.0:release_p14:*:*:*:*:*:*
freebsd freebsd 5.0 cpe:2.3:o:freebsd:freebsd:5.0:releng:*:*:*:*:*:*
freebsd freebsd 5.1 cpe:2.3:o:freebsd:freebsd:5.1:*:*:*:*:*:*:*
freebsd freebsd 5.1 cpe:2.3:o:freebsd:freebsd:5.1:alpha:*:*:*:*:*:*

References for CVE-2005-0109

URL Tags
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.24/SCOSA-2005.24.txt Third Party Advisory
http://marc.info/?l=freebsd-hackers&m=110994026421858&w=2 Mailing List
http://marc.info/?l=freebsd-security&m=110994370429609&w=2 Mailing List
http://marc.info/?l=openbsd-misc&m=110995101417256&w=2 Mailing List
http://secunia.com/advisories/15348 Permissions Required
http://secunia.com/advisories/18165 Permissions Required
http://securitytracker.com/id?1013967 Patch Third Party Advisory VDB Entry Vendor Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-26-101739-1 Vendor Advisory
http://www-1.ibm.com/support/docview.wss?uid=isg1SSRVHMCHMC_C081516_754 Broken Link
http://www.daemonology.net/hyperthreading-considered-harmful/ Third Party Advisory
http://www.daemonology.net/papers/htt.pdf Third Party Advisory
http://www.kb.cert.org/vuls/id/911878 Third Party Advisory US Government Resource
http://www.redhat.com/support/errata/RHSA-2005-476.html Not Applicable
http://www.redhat.com/support/errata/RHSA-2005-800.html Not Applicable
http://www.securityfocus.com/bid/12724 Patch Third Party Advisory VDB Entry Vendor Advisory
http://www.vupen.com/english/advisories/2005/0540 Permissions Required
http://www.vupen.com/english/advisories/2005/3002 Permissions Required
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9747 Third Party Advisory
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