#VU91231 NULL pointer dereference in Linux kernel - CVE-2021-47307
Published: June 5, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91231
Vulnerability risk: Low
CVSSv4.0: 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-2021-47307
CWE-ID: CWE-476
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 perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the cifs_compose_mount_options() function in fs/cifs/cifs_dfs_ref.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/f7d1fa65e74263d11f90ddd33b4d4cd905a93759
- https://git.kernel.org/stable/c/e58c162789becede894d3e94c0ce6695a2ef5796
- https://git.kernel.org/stable/c/ae3d181f4e912f51af7776ea165f199b16fc165d
- https://git.kernel.org/stable/c/03313d1c3a2f086bb60920607ab79ac8f8578306
- 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