What is CVE-2021-44879?

CVE-2021-44879 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-02-14.

How severe is CVE-2021-44879?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Linux Kernel

CVE-2021-44879

In gc_data_segment in fs/f2fs/gc.c in the Linux kernel before 5.16.3, special files are not considered, leading to a move_data_page NULL pointer dereference.

Published 2022-02-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: -0.000

Affected products

Linux Kernel

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.3 (Mailing List, Vendor Advisory)
bugzilla.kernel.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
lore.kernel.org/linux-f2fs-devel/20211206144421.3735-3-chao@kernel.org/T/
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
lists.debian.org/debian-lts-announce/2024/01/msg00004.html (mailing-list)
lists.debian.org/debian-lts-announce/2024/01/msg00005.html (mailing-list)

Frequently asked questions

What is CVE-2021-44879?: CVE-2021-44879 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2022-02-14.
How severe is CVE-2021-44879?: Medium severity. CVSS v3 base score is 5.5 out of 10.