CVE-2018-12896: Integer Overflow
First published: Mon Jul 02 2018(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.16-1 | |
| Linux kernel | <=4.17.3 | |
| Debian | =8.0 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 |
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Reference Links
- 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
- 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://usn.ubuntu.com/3847-1/
- https://usn.ubuntu.com/3847-2/
- https://usn.ubuntu.com/3847-3/
- https://usn.ubuntu.com/3848-1/
- https://usn.ubuntu.com/3848-2/
- https://usn.ubuntu.com/3849-1/
- https://usn.ubuntu.com/3849-2/
- https://launchpad.net/bugs/cve/CVE-2018-12896
- https://security-tracker.debian.org/tracker/CVE-2018-12896
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12896
- https://nvd.nist.gov/vuln/detail/CVE-2018-12896
- https://ubuntu.com/security/CVE-2018-12896
Frequently Asked Questions
What is the severity of CVE-2018-12896?
CVE-2018-12896 is classified as a high-severity vulnerability due to its potential for integer overflow leading to system instability.
How do I fix CVE-2018-12896?
To fix CVE-2018-12896, upgrade to a patched version of the Linux kernel, specifically 5.10.223-1, 5.10.226-1, 6.1.123-1, or later.
Which versions of the Linux kernel are affected by CVE-2018-12896?
CVE-2018-12896 affects Linux kernel versions up to and including 4.17.3.
What systems are vulnerable to CVE-2018-12896?
Systems using vulnerable versions of the Linux kernel include various distributions of Debian and Ubuntu Linux.
Can CVE-2018-12896 be exploited remotely?
CVE-2018-12896 could potentially be exploited locally, but it requires specific conditions related to POSIX timers.
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