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)
ReferencesDLA-1715-1, DLA-1731-1
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1fixed
stretch (security)4.9.210-1+deb9u1fixed
buster4.19.132-1fixed
buster (security)4.19.118-2+deb10u1fixed
bullseye, sid5.7.10-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcejessie3.16.64-1DLA-1731-1
linuxsourcestretch4.9.144-1
linuxsource(unstable)4.18.20-1
linux-4.9sourcejessie4.9.144-3.1~deb8u1DLA-1715-1

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

Search for package or bug name: Reporting problems