#VU90476 Memory leak in Linux kernel - CVE-2021-47199

Vulnerability identifier: #VU90476

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-2021-47199

CWE-ID: CWE-401

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 memory leak within the parse_tc_nic_actions() and parse_tc_fdb_actions() functions in drivers/net/ethernet/mellanox/mlx5/core/en_tc.c, within the mlx5_tc_ct_match_add(), mlx5_tc_ct_parse_action() and __mlx5_tc_ct_flow_offload_clear() functions in drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.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/486e8de6e233ff2999493533c6259d1cb538653b
https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2

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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.