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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-1715-1 linux-4.9 security update
Debian DLA Debian DLA DLA-1731-1 linux security update
Debian DLA Debian DLA DLA-1731-2 linux regression update
EUVD EUVD EUVD-2018-4849 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.
Ubuntu USN Ubuntu USN USN-3847-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-3847-2 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-3847-3 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-3848-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-3848-2 Linux kernel (Xenial HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-3849-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-3849-2 Linux kernel (Trusty HWE) vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-05T08:45:02.345Z

Reserved: 2018-06-26T00:00:00

Link: CVE-2018-12896

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2018-07-02T17:29:00.660

Modified: 2024-11-21T03:46:03.597

Link: CVE-2018-12896

cve-icon Redhat

Severity :

Publid Date: 2018-06-22T00:00:00Z

Links: CVE-2018-12896 - Bugzilla

cve-icon OpenCVE Enrichment

No data.