CVE-2017-18344

NameCVE-2017-18344
DescriptionThe timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).
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+deb8u1fixed
jessie (security)3.16.72-1fixed
stretch4.9.168-1fixed
stretch (security)4.9.168-1+deb9u5fixed
buster4.19.37-5fixed
buster (security)4.19.37-5+deb10u2fixed
bullseye4.19.37-6fixed
sid5.2.9-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.14.12-1low
linuxsourcejessie3.16.56-1low
linuxsourcestretch4.9.82-1+deb9u1low

Notes

Fixed by: https://git.kernel.org/linus/cef31d9af908243421258f1df35a4a644604efbe

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