NULL pointer dereference in Linux kernel

1) NULL pointer dereference

EUVDB-ID: #VU30283

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-20806

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the Linux kernel before 5.2. There is a NULL pointer dereference in tw5864_handle_frame() in drivers/media/pci/tw5864/tw5864-video.c, which may cause denial of service, aka CID-2e7682ebfc75. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Update to version 5.2.

Vulnerable software versions

Linux kernel: 5.0 - 5.1.21

External links

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2e7682ebfc750177a4944eeb56e97a3f05734528
http://github.com/torvalds/linux/commit/2e7682ebfc750177a4944eeb56e97a3f05734528
http://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
http://security.netapp.com/advisory/ntap-20200619-0001/
http://www.debian.org/security/2020/dsa-4698

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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