#VU90871 Use of uninitialized resource in Linux kernel - CVE-2021-47343

Vulnerability identifier: #VU90871

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-2021-47343

CWE-ID: CWE-908

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 use of uninitialized resource within the dm_btree_remove() function in drivers/md/persistent-data/dm-btree-remove.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/4c84b3e0728ffe10d89c633694c35a02b5c477dc
https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5
https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3
https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5
https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851
https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e
https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9
https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a
https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb

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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.