CVE-2018-12896

 

Published at: - 02-07-2018 07:29

Last modified: - 26-10-2022 01:44

Total changes: - 3

Description

An issue was discovered in the Linux kernel through 4.17.3. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random. For example, a local user can cause a denial of service (signed integer overflow) via crafted mmap, futex, timer_create, and timer_settime system calls.

Common Vulnerability Scoring System (CVSS)

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76
• https://github.com/lcytxw/bug_repro/tree/master/bug_200189
• https://bugzilla.kernel.org/show_bug.cgi?id=200189
• USN-3849-2-Third Party Advisory
• USN-3848-2-Third Party Advisory
• USN-3848-1-Third Party Advisory
• USN-3847-3-Third Party Advisory
• USN-3847-2-Third Party Advisory
• USN-3847-1-Third Party Advisory
• USN-3849-1-Third Party Advisory
• [debian-lts-announce] 20190315 [SECURITY] [DLA 1715-1] linux-4.9 security update-Mailing List, Third Party Advisory
• [debian-lts-announce] 20190327 [SECURITY] [DLA 1731-1] linux security update-Mailing List, Third Party Advisory
• [debian-lts-announce] 20190401 [SECURITY] [DLA 1731-2] linux regression update-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2018-12896

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures