CVE-2017-18344: canonical ubuntu_linux Out-of-bounds Read
Vulnerability summary
CVE-2017-18344 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in canonical ubuntu_linux. EPSS estimates a 3.44% chance of exploitation in the next 30 days, higher than 89% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 26 · Related 15Timeline
- 26-07-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
3.44%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.44% on 05-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundLinux Kernel 4.14.7 (Ubuntu 16.04 / CentOS 7) - (KASLR & SMEP Bypass) Arbitrary File Read
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu17 products
- linux< 3.13.0-155.205 | < 4.4.0-121.145
- linux-aws< 4.4.0-1017.17 | < 4.4.0-1055.64
- linux-azure< 4.15.0-1013.13~16.04.2
- linux-azure-fdeAll versions (No fix recorded)
- linux-euclid< 4.4.0-9029.31
Redhat7 products
- enterprise_linux_desktop7.0
- enterprise_linux_server7.0
- enterprise_linux_server_aus7.2 | 7.3 | 7.4
- enterprise_linux_server_eus7.3 | 7.5
- enterprise_linux_server_tus7.2 | 7.3 | 7.4
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04
Debian1 product
- linux< 4.14.12-1
Linux1 product
- linux_kernel< 4.14.8
5 vendors · 27 products
References
21 links- github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbeX Refsource MISCPatchThird Party AdvisoryREPORT
