NULL pointer dereference in Linux kernel



| Updated: 2020-07-17
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-20806
CWE-ID CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU30283

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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

CPE2.3 External links

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



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