#VU90103 Use-after-free in Linux kernel - CVE-2021-47311
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90103
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-2021-47311
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 emac_remove() function in drivers/net/ethernet/qualcomm/emac/emac.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/4d04a42b926e682140776e54188f4a44f1f01a81
- https://git.kernel.org/stable/c/b1e091331920f8fbfc747dcbd16263fcd71abb2d
- https://git.kernel.org/stable/c/11e9d163d631198bb3eb41a677a61b499516c0f7
- https://git.kernel.org/stable/c/2b70ca92847c619d6264c7372ef74fcbfd1e048c
- https://git.kernel.org/stable/c/b560521eca03d0a2db6093a5a632cbdd0a0cf833
- https://git.kernel.org/stable/c/8a225a6e07a57a1538d53637cb3d82bd3e477839
- https://git.kernel.org/stable/c/ad297cd2db8953e2202970e9504cab247b6c7cb4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.241
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.199
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.277
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.53
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.135