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CVE
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CVE-2018-12896Date: (C)2018-07-03   (M)2024-03-26


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 5.5CVSS Score : 2.1
Exploit Score: 1.8Exploit Score: 3.9
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: LOCALAccess Vector: LOCAL
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: LOWAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
USN-3847-1
USN-3847-2
USN-3847-3
USN-3848-1
USN-3848-2
USN-3849-1
USN-3849-2
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
https://bugzilla.kernel.org/show_bug.cgi?id=200189
https://github.com/lcytxw/bug_repro/tree/master/bug_200189
https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76

CPE    6
cpe:/o:canonical:ubuntu_linux:12.04::~~esm~~~
cpe:/o:debian:debian_linux:8.0
cpe:/o:canonical:ubuntu_linux:18.04::~~lts~~~
cpe:/o:linux:linux_kernel
...
CWE    1
CWE-190
OVAL    29
oval:org.secpod.oval:def:114788
oval:org.secpod.oval:def:704464
oval:org.secpod.oval:def:89002353
oval:org.secpod.oval:def:51185
...

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