Release Date: | 2018-07-02 |
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.
See more information about CVE-2018-12896 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
Base Score: | 5.5 | Base Metrics: | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Access Vector: | Local network | Attack Complexity: | Low |
Privileges Required: | Low | User Interaction: | None |
Scope: | Unchanged | Confidentiality Impact: | None |
Integrity Impact: | None | Availability Impact: | High |
Platform | Errata | Release Date |
Oracle Linux version 7 (kernel-uek) | ELSA-2018-4242 | 2018-10-10 |
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