Description

crypto/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.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dd504589577d8e8e70f51f997ad487a4cb6c026f

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.2

http://www.openwall.com/lists/oss-security/2016/11/04/3

http://www.securityfocus.com/bid/94217

https://access.redhat.com/errata/RHSA-2017:1842

https://access.redhat.com/errata/RHSA-2017:2077

https://access.redhat.com/errata/RHSA-2017:2437

https://access.redhat.com/errata/RHSA-2017:2444

https://bugzilla.redhat.com/show_bug.cgi?id=1386286

https://github.com/torvalds/linux/commit/dd504589577d8e8e70f51f997ad487a4cb6c026f

https://groups.google.com/forum/#!msg/syzkaller/frb2XrB5aWk/xCXzkIBcDAAJ

Details

Risk Information

CVSS v2

CVSS v3