CVE-2015-4170

NameCVE-2015-4170
DescriptionRace condition in the ldsem_cmpxchg function in drivers/tty/tty_ldsem.c in the Linux kernel before 3.13-rc4-next-20131218 allows local users to cause a denial of service (ldsem_down_read and ldsem_down_write deadlock) by establishing a new tty thread during shutdown of a previous tty thread.
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 severitymedium (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie (security), jessie3.16.56-1+deb8u1fixed
stretch4.9.82-1+deb9u3fixed
stretch (security)4.9.88-1+deb9u1fixed
buster4.16.12-1fixed
sid4.16.16-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)3.13.4-1medium
linuxsourcewheezy(not affected)
linux-2.6source(unstable)(not affected)

Notes

[wheezy] - linux <not-affected> (commit 4898e640caf03fdbaf2122d5a33949bf3e4a5b34 not backported)
- linux-2.6 <not-affected> (commit 4898e640caf03fdbaf2122d5a33949bf3e4a5b34 not backported)
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf872776fc84128bb779ce2b83a37c884c3203ae (v3.13-rc5)
Affected code was introduced by the rewrite in https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4898e640caf03fdbaf2122d5a33949bf3e4a5b34 (v3.11-rc1)
http://www.openwall.com/lists/oss-security/2015/05/26/1

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