CVE-2018-12896

NameCVE-2018-12896
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1vulnerable
jessie (security)3.16.57-2vulnerable
stretch4.9.110-1vulnerable
stretch (security)4.9.110-3+deb9u4vulnerable
buster4.18.6-1vulnerable
sid4.18.8-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)(unfixed)low

Notes

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

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