Use-after-free in Linux kernel - CVE-2021-46991
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90251
CSH Severity: 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-2021-46991
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
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 i40e_client_subtask() function in drivers/net/ethernet/intel/i40e/i40e_client.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/c1322eaeb8af0d8985b5cc5fa759140fa0e57b84
- https://git.kernel.org/stable/c/d718c15a2bf9ae082d5ae4d177fb19ef23cb4132
- https://git.kernel.org/stable/c/829a713450b8fb127cbabfc1244c1d8179ec5107
- https://git.kernel.org/stable/c/4ebc10aa7cd17fd9857dedac69600465c9dd16d1
- https://git.kernel.org/stable/c/1fd5d262e7442192ac7611ff1597a36c5b044323
- https://git.kernel.org/stable/c/38318f23a7ef86a8b1862e5e8078c4de121960c3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.191
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.38
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.22
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.120