#VU89745 Improper locking in Linux kernel - CVE-2021-47041

Vulnerability identifier: #VU89745

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-47041

CWE-ID: CWE-667

Exploitation vector: Network

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the nvmet_tcp_state_change() function in drivers/nvme/target/tcp.c. An remote attacker can send specially crafted packets to the system and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/999d606a820c36ae9b9e9611360c8b3d8d4bb777
https://git.kernel.org/stable/c/60ade0d56b06537a28884745059b3801c78e03bc
https://git.kernel.org/stable/c/06beaa1a9f6e501213195e47c30416032fd2bbd5
https://git.kernel.org/stable/c/906c538340dde6d891df89fe7dac8eaa724e40da
https://git.kernel.org/stable/c/b5332a9f3f3d884a1b646ce155e664cc558c1722

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.