#VU90403 NULL pointer dereference in Linux kernel - CVE-2021-47484

Vulnerability identifier: #VU90403

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-2021-47484

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 nix_free_tx_vtag_entries() function in drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c, within the rvu_dbg_qsize_write() function in drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.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
http://git.kernel.org/stable/c/f1e3cd1cc80204fd02b9e9843450925a2af90dc0
http://git.kernel.org/stable/c/c2d4c543f74c90f883e8ec62a31973ae8807d354

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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.