Use-after-free in Linux kernel - CVE-2021-47224
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90087
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2021-47224
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the temac_start_xmit() function in drivers/net/ethernet/xilinx/ll_temac_main.c. A local user can escalate privileges on the system.
Affected software
Linux kernel
How to mitigate CVE-2021-47224
Install update from vendor's website.
Linux kernel - addressed in versions 5.4.128, 5.10.46, 5.12.13, 5.13
External References
- https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3
- https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358
- https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b
- https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.46
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.128