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Integer Overflow or Wraparound Affecting kernel-uek-devel package, versions <0:4.14.35-1818.3.3.el7uek

Severity

 Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-ORACLE7-KERNELUEKDEVEL-2530620
  • published10 Apr 2022
  • disclosed2 Jul 2018
Report a new vulnerability Found a mistake?

Introduced: 2 Jul 2018

CVE-2018-12896  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Oracle:7 kernel-uek-devel to version 0:4.14.35-1818.3.3.el7uek or higher.
This issue was patched in ELSA-2018-4242.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-devel package and not the kernel-uek-devel package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

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.