#VU93380 Race condition in Linux kernel - CVE-2021-47189

Vulnerability identifier: #VU93380

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-2021-47189

CWE-ID: CWE-362

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 a race condition within the run_ordered_work() and normal_work_helper() functions in fs/btrfs/async-thread.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/bd660a20fea3ec60a49709ef5360f145ec0fe779
https://git.kernel.org/stable/c/637d652d351fd4f263ef302dc52f3971d314e500
https://git.kernel.org/stable/c/804a9d239ae9cbe88e861a7cd62319cc6ec7b136
https://git.kernel.org/stable/c/ed058d735a70f4b063323f1a7bb33cda0f987513
https://git.kernel.org/stable/c/670f6b3867c8f0f11e5097f353b164cecfec6179
https://git.kernel.org/stable/c/6adbc07ebcaf8bead08b21687d49e0fc94400987
https://git.kernel.org/stable/c/47e6f9f69153247109042010f3a77579e9dc61ff
https://git.kernel.org/stable/c/45da9c1767ac31857df572f0a909fbe88fd5a7e9

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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.