CVE-2018-12896 Detail
Current 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.
Source:
MITRE
Description Last Modified:
07/02/2018
View Analysis Description
Analysis 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.
Source:
MITRE
Description Last Modified:
07/02/2018
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
5.5 MEDIUM
Vector:
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
(V3 legend)
Impact Score:
3.6
Exploitability Score:
1.8
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High
CVSS v2.0 Severity and Metrics:
Base Score:
2.1 LOW
Vector:
(AV:L/AC:L/Au:N/C:N/I:N/A:P)
(V2 legend)
Impact Subscore:
2.9
Exploitability Subscore:
3.9
Access Vector (AV):
Local
Access Complexity (AC):
Low
Authentication (AU):
None
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
Partial
Additional Information:
Allows disruption of service
References to Advisories, Solutions, and Tools
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Technical Details
Vulnerability Type
(View All)
- Integer Overflow or Wraparound (CWE-190)
Change History
1 change record found
- show changes
Initial Analysis -
9/4/2018 10:50:07 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (including) 4.17.3 |
| Added |
CVSS V2 |
|
(AV:L/AC:L/Au:N/C:N/I:N/A:P) |
| Added |
CVSS V3 |
|
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Added |
CWE |
|
CWE-190 |
| Changed |
Reference Type |
https://bugzilla.kernel.org/show_bug.cgi?id=200189 No Types Assigned |
https://bugzilla.kernel.org/show_bug.cgi?id=200189 Issue Tracking, Vendor Advisory |
| Changed |
Reference Type |
https://github.com/lcytxw/bug_repro/tree/master/bug_200189 No Types Assigned |
https://github.com/lcytxw/bug_repro/tree/master/bug_200189 Exploit, Third Party Advisory |
| Changed |
Reference Type |
https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76 No Types Assigned |
https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76 Patch, Third Party Advisory |
Quick Info
CVE Dictionary Entry:
CVE-2018-12896
NVD Published Date:
07/02/2018
NVD Last Modified:
09/04/2018
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