Out-of-bounds Read in Linux Kernel
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).
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.034 (88.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.034 · change: +0.001
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 12.04, 14.04
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Server — versions 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.2, 7.3, 7.4
- Red Hat Enterprise Linux Server Eus — versions 7.3, 7.5
- Red Hat Enterprise Linux Server Tus — versions 7.2, 7.3, 7.4
- Red Hat Enterprise Linux Workstation — versions 7.0
- Red Hat Mrg Realtime — versions 2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2018:3540 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3083 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3591 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3459 (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1041414 (VDB Entry, Third Party Advisory, vdb-entry)
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8 (Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3590 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:2948 (vendor-advisory, Third Party Advisory)
- github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe (Patch, Third Party Advisory)
- usn.ubuntu.com/3742-2/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-18344?
- CVE-2017-18344 is a medium-severity vulnerability in Linux Kernel, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2018-07-26.
- How severe is CVE-2017-18344?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2017-18344 known to be exploited?
- 24 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.