#VU90090 Use-after-free in Linux kernel - CVE-2021-47247 

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Main Vulnerability Database Vulnerabilities #VU90090

#VU90090 Use-after-free in Linux kernel - CVE-2021-47247

Published: May 31, 2024 / Updated: May 14, 2025


Vulnerability identifier: #VU90090
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47247
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Linux kernel
Software vendor:
Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the mlx5e_take_all_route_decap_flows() and mlx5e_encap_valid() functions in drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c, within the wait_for_completion() and mlx5e_take_all_encap_flows() functions in drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c, within the mlx5e_rep_neigh_update() and mlx5e_rep_update_flows() functions in drivers/net/ethernet/mellanox/mlx5/core/en/rep/neigh.c. A local user can escalate privileges on the system.


Remediation

Install update from vendor's website.

External links