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…
Does this matter?
Lower severity and a low EPSS score (3.44%). Track it; it rarely justifies an emergency change on its own.
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).
- CVSS 3.0
- 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 3.44% probability · 89th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel · canonical/ubuntu linux · redhat/mrg realtime · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux server tus · redhat/enterprise linux workstation
- Source
- cve@mitre.org
EPSS 3.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/104909Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041414Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2948Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3083Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3096Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3459Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3540Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3586Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3590Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3591Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8Third Party Advisory
- https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbePatch, Third Party Advisory
- https://usn.ubuntu.com/3742-1/Third Party Advisory
- https://usn.ubuntu.com/3742-2/Third Party Advisory
- https://www.exploit-db.com/exploits/45175/Exploit, Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/104909Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041414Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2948Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3083Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3096Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3459Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3540Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3586Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3590Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3591Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8Third Party Advisory
- https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbePatch, Third Party Advisory
- https://usn.ubuntu.com/3742-1/Third Party Advisory
- https://usn.ubuntu.com/3742-2/Third Party Advisory
- https://www.exploit-db.com/exploits/45175/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.