Vulnerability Details : CVE-2018-12896
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.
Vulnerability category: OverflowDenial of service
Products affected by CVE-2018-12896
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-12896
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 8 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-12896
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2018-12896
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-12896
-
https://github.com/lcytxw/bug_repro/tree/master/bug_200189
bug_repro/bug_200189 at master · lcytxw/bug_repro · GitHubExploit;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
[SECURITY] [DLA 1715-1] linux-4.9 security updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/3848-1/
USN-3848-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
[SECURITY] [DLA 1731-2] linux regression updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/3847-2/
USN-3847-2: Linux kernel (HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://usn.ubuntu.com/3847-3/
USN-3847-3: Linux kernel (Azure) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
[SECURITY] [DLA 1731-1] linux security updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/3849-1/
USN-3849-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76
posix-timers: Sanitize overrun handling · torvalds/linux@78c9c4d · GitHubPatch;Third Party Advisory
-
https://usn.ubuntu.com/3847-1/
USN-3847-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://usn.ubuntu.com/3848-2/
USN-3848-2: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://bugzilla.kernel.org/show_bug.cgi?id=200189
200189 – UBSAN: Undefined behaviour in kernel/time/posix-timers.c:705Issue Tracking;Vendor Advisory
-
https://usn.ubuntu.com/3849-2/
USN-3849-2: Linux kernel (Trusty HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
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