Memory leak in Linux kernel - CVE-2021-47508
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90436
CSH Severity: Low
CVSS v4.0: 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-2021-47508
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the btrfs_check_data_free_space() and btrfs_delalloc_reserve_space() functions in fs/btrfs/delalloc-space.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2021-47508
Install update from vendor's website.