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…
- 5.5MediumCVSS base score
- 0.63%Exploitation in 30 daysEPSS · top 49% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 6 days later
· 6 days later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.63% · top 49% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
n/a
- affected n/a
References
13
- https://bugzilla.kernel.org/show_bug.cgi?id=200189 (opens in a new tab)x_refsource_MISCx_transferred
- USN-3848-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3847-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76 (opens in a new tab)x_refsource_MISCx_transferred
- USN-3847-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3849-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3849-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3848-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3847-3 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- https://github.com/lcytxw/bug_repro/tree/master/bug_200189 (opens in a new tab)x_refsource_MISCx_transferred
- [debian-lts-announce] 20190315 [SECURITY] [DLA 1715-1] linux-4.9 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20190327 [SECURITY] [DLA 1731-1] linux security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20190401 [SECURITY] [DLA 1731-2] linux regression update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2018-4849 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2018-12896)Record last updated .