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MEDIUM

CVE-2017-18344

CVSS v3

5.5

MEDIUM

EPSS Score

3.4 %

exploit probability, as of 2026-10-20

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2017-18344 Red Hat Product Security672 products fixed

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

  • RHSA-2018:3591 Red Hat Product Security111 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2018:3590 Red Hat Product Security75 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2018:3540 Red Hat Product Security111 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2018:3586 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

  • RHSA-2018:3459 Red Hat Product Security111 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

3 more advisories

Full record on NVD

Description

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

Technical details

Published
2018-07-26
Exploit-DB
EDB-45175

Frequently asked questions

What is CVE-2017-18344?

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

Is CVE-2017-18344 actively exploited?

Active exploitation of CVE-2017-18344 has not been confirmed. Its EPSS score was 3.4% on 2026-10-20, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-18344?

CVE-2017-18344 has a CVSS v3 base score of 5.5 (MEDIUM severity).

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