CVE-2015-8970

NameCVE-2015-8970
Descriptioncrypto/algif_skcipher.c in the Linux kernel before 4.4.2 does not verify that a setkey operation has been performed on an AF_ALG socket before an accept system call is processed, which allows local users to cause a denial of service (NULL pointer dereference and system crash) via a crafted application that does not supply a key, related to the lrw_crypt function in crypto/lrw.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, 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)wheezy3.2.78-1fixed
wheezy (security)3.2.93-1fixed
jessie3.16.43-2+deb8u2fixed
jessie (security)3.16.43-2+deb8u5fixed
stretch4.9.51-1fixed
stretch (security)4.9.30-2+deb9u5fixed
buster4.13.4-1fixed
sid4.13.4-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.4.2-1medium
linuxsourcejessie3.16.7-ckt25-1medium
linuxsourcewheezy3.2.78-1medium

Notes

https://groups.google.com/forum/#!msg/syzkaller/frb2XrB5aWk/xCXzkIBcDAAJ
https://bugzilla.redhat.com/show_bug.cgi?id=1386286
Fixed by: https://git.kernel.org/linus/dd504589577d8e8e70f51f997ad487a4cb6c026f (v4.5-rc1)
Followed by a complete set of related upstrema commits. See kernel-sec
triage for details.
http://www.openwall.com/lists/oss-security/2016/11/03/6

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