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CVE-2015-5307

15
FAUCET Score

CVE-2015-5307 describes a denial-of-service vulnerability affecting the KVM subsystem in the Linux kernel (through 4.2.6) and Xen (4.3.x through 4.6.x). A malicious guest OS user can trigger numerous Alignment Check exceptions, leading to a host OS panic or hang. This vulnerability has a CVSS score of 4.9, indicating a low attack complexity and requiring local access, with the potential for complete availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.3CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
4.3.0CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*
4.3.1CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*
4.3.2CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:*
4.3.3CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.3.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.9MEDIUM

AV:L/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.57%
Probability of exploitation in next 30 days
EPSS Percentile
43.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0057 is in the 80th percentile among its peer group of 3,052 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (11)

oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel-0:2.6.32-573.12.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.2 Advanced Update SupportFixed in: kernel-0:2.6.32-220.65.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.4 Advanced Update SupportFixed in: kernel-0:2.6.32-358.69.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.5 Advanced Update SupportFixed in: kernel-0:2.6.32-431.68.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.6 Extended Update SupportFixed in: kernel-0:2.6.32-504.40.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-327.3.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.1 Extended Update SupportFixed in: kernel-0:3.10.0-229.24.2.ael7b
View patch
github_advisoryvendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: kvm

Vendor Advisories (1)

redhatCVE-2015-5307Important

virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception

Nov 10, 2015

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
Vendor Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-November/172187.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-November/172300.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-November/172435.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-11/msg00035.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00005.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00026.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00031.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-02/msg00013.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-08/msg00038.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2015-12/msg00039.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2015-12/msg00053.html
Mailing ListThird Party Advisory
rhn.redhat.com / errata/RHSA-2015-2636.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2015-2645.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2016-0046.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / torvalds/linux/commit/54a20552e1eae07aa240fa370a0293e006b5faed
Vendor Advisory
kb.juniper.net / JSA10783
Third Party Advisory
support.citrix.com / article/CTX202583
Third Party Advisory
debian.org / security/2015/dsa-3396
Third Party Advisory
debian.org / security/2015/dsa-3414
Third Party Advisory
debian.org / security/2016/dsa-3454
Third Party Advisory
openwall.com / lists/oss-security/2015/11/10/6
Mailing ListThird Party Advisory
oracle.com / technetwork/topics/security/cpujan2016-2367955.html
PatchVendor Advisory
oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html
Vendor Advisory
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
Vendor Advisory
oracle.com / technetwork/topics/security/ovmbulletinjul2016-3090546.html
Vendor Advisory
securityfocus.com / bid/77528
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034105
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2800-1
Third Party Advisory
ubuntu.com / usn/USN-2801-1
Third Party Advisory
ubuntu.com / usn/USN-2802-1
Third Party Advisory
ubuntu.com / usn/USN-2803-1
Third Party Advisory
ubuntu.com / usn/USN-2804-1
Third Party Advisory
ubuntu.com / usn/USN-2805-1
Third Party Advisory
ubuntu.com / usn/USN-2806-1
Third Party Advisory
ubuntu.com / usn/USN-2807-1
Third Party Advisory
xenbits.xen.org / xsa/advisory-156.html
Vendor Advisory