#VU90502 NULL pointer dereference in Linux kernel - CVE-2021-47399

Vulnerability identifier: #VU90502

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-2021-47399

CWE-ID: CWE-476

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 NULL pointer dereference within the ixgbe_xdp_setup() function in drivers/net/ethernet/intel/ixgbe/ixgbe_main.c, within the ixgbe_max_channels() function in drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.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/20f6c4a31a525edd9ea6243712b868ba0e4e331e
https://git.kernel.org/stable/c/2744341dd52e935344ca1b4bf189ba0d182a3e8e
https://git.kernel.org/stable/c/513e605d7a9ce136886cb42ebb2c40e9a6eb6333

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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.