#VU91509 Improper locking in Linux kernel - CVE-2021-47350

Vulnerability identifier: #VU91509

Vulnerability risk: Low

CVSSv4.0: [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-2021-47350

CWE-ID: CWE-667

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 improper locking within the bad_kernel_fault() function in arch/powerpc/mm/fault.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
http://git.kernel.org/stable/c/a82471a14aad90f79d1608d2bcbb019f0ffb53f0
http://git.kernel.org/stable/c/d2e52d4664097a6c1f591d869ec594bd7a0d4925
http://git.kernel.org/stable/c/500f81cec9f1bfa5210aa9dd5ba9a06e22f62a35
http://git.kernel.org/stable/c/8a96ec5ebf96ad8e2ba7b1b34103a0be5140fc70
http://git.kernel.org/stable/c/cd5d5e602f502895e47e18cd46804d6d7014e65c

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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.