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.
The product dereferences a pointer that it expects to be valid but is NULL.
| Link | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2017:2437 | vendor advisory |
| http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.2 | release notes |
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dd504589577d8e8e70f51f997ad487a4cb6c026f | patch vendor advisory issue tracking |
| https://access.redhat.com/errata/RHSA-2017:2444 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2077 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:1842 | vendor advisory |
| https://github.com/torvalds/linux/commit/dd504589577d8e8e70f51f997ad487a4cb6c026f | patch third party advisory issue tracking |
| http://www.openwall.com/lists/oss-security/2016/11/04/3 | third party advisory mailing list |
| https://bugzilla.redhat.com/show_bug.cgi?id=1386286 | issue tracking |
| http://www.securityfocus.com/bid/94217 | third party advisory vdb entry |
| https://groups.google.com/forum/#%21msg/syzkaller/frb2XrB5aWk/xCXzkIBcDAAJ |