CVE-2018-12896

Name	CVE-2018-12896
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-1715-1, DLA-1731-1, ELA-111-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	jessie, jessie (lts)	3.16.84-1	fixed
	stretch (security)	4.9.320-2	fixed
	stretch (lts), stretch	4.9.320-3	fixed
	buster (security), buster, buster (lts)	4.19.316-1	fixed
	bullseye	5.10.223-1	fixed
	bullseye (security)	5.10.226-1	fixed
	bookworm	6.1.115-1	fixed
	bookworm (security)	6.1.119-1	fixed
	trixie	6.12.5-1	fixed
	sid	6.12.6-1	fixed
linux-4.9 (PTS)	jessie, jessie (lts)	4.9.303-1~deb8u3	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	wheezy	3.16.64-2~deb7u1	ELA-111-1
linux	source	jessie	3.16.64-1	DLA-1731-1
linux	source	stretch	4.9.144-1
linux	source	(unstable)	4.18.20-1
linux-4.9	source	jessie	4.9.144-3.1~deb8u1	DLA-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