NULL pointer dereference in Linux kernel - CVE-2021-44879
Published: April 21, 2022
Vulnerability identifier: #VU62483
CSH Severity: 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-2021-44879
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 a NULL pointer dereference error in the gc_data_segment() function in fs/f2fs/gc.c. A local user can mount a specially crafted f2fs image, trigger a NULL pointer dereference and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://bugzilla.kernel.org/show_bug.cgi?id=215231
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.3
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9056d6489f5a41cfbb67f719d2c0ce61ead72d9f
- https://lore.kernel.org/linux-f2fs-devel/20211206144421.3735-3-chao@kernel.org/T/