#VU92072 NULL pointer dereference in Linux kernel - CVE-2021-47206

Vulnerability identifier: #VU92072

Vulnerability 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-2021-47206

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

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 ohci_hcd_tmio_drv_probe() function in drivers/usb/host/ohci-tmio.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/28e016e02118917e50a667bc72fb80098cf2b460
https://git.kernel.org/stable/c/2f18f97a1a787154a372c0738f1576f14b693d91
https://git.kernel.org/stable/c/bb6ed2e05eb6e8619b30fa854f9becd50c11723f
https://git.kernel.org/stable/c/951b8239fd24678b56c995c5c0456ab12e059d19
https://git.kernel.org/stable/c/f98986b7acb4219f95789095eced93ed69d81d35
https://git.kernel.org/stable/c/2474eb7fc3bfbce10f7b8ea431fcffe5dd5f5100
https://git.kernel.org/stable/c/065334f6640d074a1caec2f8b0091467a22f9483
https://git.kernel.org/stable/c/9eff2b2e59fda25051ab36cd1cb5014661df657b

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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.