CVE-2021-28950

MEDIUMNVD 5.55.5—

5.5

An issue was discovered in fs/fuse/fuse_i.h in the Linux kernel before 5.11.8. A "stall on CPU" can occur because a retry loop continually finds the same bad inode, aka CID-775c5033a0d1.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 8.0%
KEV: Not listed

Published

March 20, 2021

Last Modified

November 21, 2024

References (14)

cve@mitrehttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
cve@mitrehttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=775c5033a0d164622d9d10dd0f0a5531639ed3ed
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/
cve@mitrehttps://www.debian.org/security/2022/dsa-5096
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=775c5033a0d164622d9d10dd0f0a5531639ed3ed
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2022/dsa-5096

Patch Availability(7)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-virtual-hwe-20.04-edge (5.8.0.55.60) @ groovy	2026-05-23	ubuntu
ubuntu	linux-image-oem-20.04b (5.10.0.1021.22) @ focal	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-18.04-edge (5.4.0.74.77) @ focal	2026-05-23	ubuntu
redhat	kernel-0:4.18.0-305.28.1.el8_4	2021-11-15	redhat
redhat	kernel-rt-0:4.18.0-305.28.1.rt7.100.el8_4	2021-11-15	redhat
redhat	kernel-rt-0:4.18.0-348.rt7.130.el8	2021-11-09	redhat
redhat	kernel-0:4.18.0-348.el8	2021-11-09	redhat

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-834Excessive Iteration

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 11× in last 7d / 19× 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.

2026-06-02 20:11 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
2026-05-29 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 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 08:01 UTCEG score recompute
2026-05-23 08:01 UTCVendor advisory
2026-05-23 08:01 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-28950?

CVE-2021-28950 is a medium vulnerability published on March 20, 2021. An issue was discovered in fs/fuse/fuse_i.h in the Linux kernel before 5.11.8. A "stall on CPU" can occur because a retry loop continually finds the same bad inode, aka CID-775c5033a0d1.

When was CVE-2021-28950 disclosed?

CVE-2021-28950 was first published in the National Vulnerability Database on March 20, 2021, 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-2021-28950 actively exploited?

CVE-2021-28950 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-28950?

CVE-2021-28950 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-28950?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28950, 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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