#VU94145 Input validation error in Linux kernel - CVE-2021-47001

Vulnerability identifier: #VU94145

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-2021-47001

CWE-ID: CWE-20

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 input validation within the rpcrdma_xprt_connect() and rpcrdma_post_sends() functions in net/sunrpc/xprtrdma/verbs.c, within the rpcrdma_reply_handler() function in net/sunrpc/xprtrdma/rpc_rdma.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/eddae8be7944096419c2ae29477a45f767d0fcd4
https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95
https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0
https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c

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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.