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CVE-2017-18344

22
FAUCET Score

CVE-2017-18344 is an out-of-bounds read vulnerability in the Linux kernel, specifically affecting versions before 4.14.8, impacting Canonical, Linux, and Red Hat distributions. This flaw, residing in the timer_create syscall implementation, allows a local attacker to read arbitrary kernel memory by exploiting improper validation of the sigevent->sigev_notify field when /proc/$PID/timers is accessed. With a CVSS score of 5.5 (Medium), it requires local access and has high confidentiality impact but no integrity or availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.14.8CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:a:redhat:mrg_realtime:2.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.23%
Probability of exploitation in next 30 days
EPSS Percentile
86.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0323 is in the 99th percentile among its peer group of 15,938 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (11)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt-0:3.10.0-957.rt56.910.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-alt-0:4.14.0-115.el7a
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-957.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.2 Advanced Update SupportFixed in: kernel-0:3.10.0-327.76.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.2 Telco Extended Update SupportFixed in: kernel-0:3.10.0-327.76.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.2 Update Services for SAP SolutionsFixed in: kernel-0:3.10.0-327.76.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.3 Extended Update SupportFixed in: kernel-0:3.10.0-514.61.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.4 Extended Update SupportFixed in: kernel-0:3.10.0-693.43.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.5 Extended Update SupportFixed in: kernel-0:3.10.0-862.20.2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: kernel-rt-1:3.10.0-693.43.1.rt56.630.el6rt
View patch

Vendor Advisories (1)

redhatCVE-2017-18344Important

kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c

Dec 15, 2017

References

access.redhat.com / errata/RHSA-2018:2948
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3083
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3096
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3459
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3540
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3586
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3590
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3591
Third Party Advisory
cdn.kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.14.8
Third Party Advisory
github.com / torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe
PatchThird Party Advisory
usn.ubuntu.com / 3742-1
Third Party Advisory
usn.ubuntu.com / 3742-2
Third Party Advisory
exploit-db.com / exploits/45175
ExploitThird Party AdvisoryVDB Entry
securityfocus.com / bid/104909
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041414
Third Party AdvisoryVDB Entry