CVE-2021-44879

MEDIUMNVD 5.55.5—

5.5

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.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 20.4%
KEV: Not listed

Published

February 14, 2022

Last Modified

November 21, 2024

References (12)

cve@mitrehttps://bugzilla.kernel.org/show_bug.cgi?id=215231
cve@mitrehttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.3
cve@mitrehttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9056d6489f5a41cfbb67f719d2c0ce61ead72d9f
cve@mitrehttps://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
cve@mitrehttps://lore.kernel.org/linux-f2fs-devel/20211206144421.3735-3-chao%40kernel.org/T/
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.kernel.org/show_bug.cgi?id=215231
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9056d6489f5a41cfbb67f719d2c0ce61ead72d9f
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
af854a3a-2127-422b-91ae-364da2661108https://lore.kernel.org/linux-f2fs-devel/20211206144421.3735-3-chao%40kernel.org/T/

Patch Availability(7)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-oem-5.14-tools-host (5.14.0-1024.26) @ focal	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (5.13.0.40.49) @ impish	2026-05-26	ubuntu
ubuntu	linux-virtual-hwe-18.04-edge (5.4.0.173.171) @ focal	2026-05-26	ubuntu
ubuntu	linux-xilinx-zynqmp-tools-5.4.0-1039 (5.4.0-1039.43) @ focal	2026-05-26	ubuntu
ubuntu	linux-tools-oracle-lts-20.04 (5.4.0.1119.112) @ focal	2026-05-26	ubuntu
ubuntu	linux-tools-aws-lts-20.04 (5.4.0.1120.117) @ focal	2026-05-26	ubuntu
ubuntu	linux-tools-azure-lts-20.04 (5.4.0.1126.119) @ focal	2026-05-26	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-476NULL Pointer Dereference

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-44879?

CVE-2021-44879 is a medium vulnerability published on February 14, 2022. In gcdatasegment in fs/f2fs/gc.c in the Linux kernel before 5.16.3, special files are not considered, leading to a movedatapage NULL pointer dereference.

When was CVE-2021-44879 disclosed?

CVE-2021-44879 was first published in the National Vulnerability Database on February 14, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-44879 actively exploited?

CVE-2021-44879 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-44879?

CVE-2021-44879 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-44879?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-44879, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-44879

Published

Last Modified

References (12)

Patch Availability(7)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-44879?

Same vendor

Same CWE

CVE-2021-44879

📅 Published

🔄 Last Modified

🔗 References (12)

Patch Availability(7)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-44879?

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References (12)

Frequently asked(5)

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