NULL pointer dereference in Linux kernel crypto

1) NULL pointer dereference

EUVDB-ID: #VU90674

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-10147

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the mcryptd_check_internal() and mcryptd_create_hash() functions in crypto/mcryptd.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.8 - 4.8.14

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.8.14:*:*:*:*:*:*:*

External links

http://github.com/torvalds/linux/commit/48a992727d82cb7db076fa15d372178743b1f4cd
http://bugzilla.redhat.com/show_bug.cgi?id=1404200
http://www.openwall.com/lists/oss-security/2017/01/17/13
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.15
http://marc.info/?l=linux-crypto-vger&m=148063683310477&w=2
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd
http://www.securityfocus.com/bid/95677
http://access.redhat.com/errata/RHSA-2017:2077
http://access.redhat.com/errata/RHSA-2017:1842

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.