Denial of service in Linux kernel

1) Input validation error

EUVDB-ID: #VU28171

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12769

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in the "drivers/spi/spi-dw.c" file. A local user can cause a panic via concurrent calls to "dw_spi_irq" and "dw_spi_transfer_one" and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.4 - 5.4.16

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.4.16:*:*:*:*:*:*:*

External links

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.17
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19b61392c5a852b4e8a0bf35aecb969983c5932d
https://lkml.org/lkml/2020/2/3/559

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.