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CVE-2017-18344

UnknownEPSS 3.23%

Last modified

CVE-2017-18344 is a vulnerability of currently unknown severity. 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).. EPSS estimates a 3.23% chance of exploitation in the next 30 days.

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).

Metrics

EPSS Probability
3.23%

86.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel< 4.14.8
CanonicalUbuntu Linux12.04
CanonicalUbuntu Linux14.04
RedhatMrg Realtime2.0
RedhatEnterprise Linux Desktop7.0
RedhatEnterprise Linux Server7.0
RedhatEnterprise Linux Server Aus7.2
RedhatEnterprise Linux Server Aus7.3
RedhatEnterprise Linux Server Aus7.4
RedhatEnterprise Linux Server Eus7.3
RedhatEnterprise Linux Server Eus7.5
RedhatEnterprise Linux Server Tus7.2
RedhatEnterprise Linux Server Tus7.3
RedhatEnterprise Linux Server Tus7.4
RedhatEnterprise Linux Workstation7.0

References

Timeline

Published
Last Modified
Status
Modified

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).
How severe is CVE-2017-18344?
Severity scoring for CVE-2017-18344 is pending analysis. The EPSS model estimates a 3.23% probability of exploitation in the next 30 days.
How do I fix CVE-2017-18344?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-18344?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST