NULL pointer dereference in Linux kernel - CVE-2021-46982
Published: June 1, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90642
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-46982
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the f2fs_unlock_rpages(), f2fs_read_multi_pages() and f2fs_put_rpages() functions in fs/f2fs/compress.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46982
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.38, 5.11.22, 5.12.5, 5.13
External References
- https://git.kernel.org/stable/c/5639b73fd3bc6fc8ca72e3a9ac15aacaabd7ebff
- https://git.kernel.org/stable/c/64acb100fe3beb5d20184d0ae3307235bd3555c4
- https://git.kernel.org/stable/c/936158b15e2648253afb824d252c910c496d34b5
- https://git.kernel.org/stable/c/a949dc5f2c5cfe0c910b664650f45371254c0744
- 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