CVE-2021-33655

MEDIUMNVD 6.77.8▲

6.7

When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.

CVSS v3: 6.7
EG Score: 7.8(medium)
EPSS: 6.9%
KEV: Not listed

Published

July 18, 2022

Last Modified

November 21, 2024

References (8)

securities@openeulerhttp://www.openwall.com/lists/oss-security/2022/07/19/2
securities@openeulerhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4
securities@openeulerhttps://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
securities@openeulerhttps://www.debian.org/security/2022/dsa-5191
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/07/19/2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2022/dsa-5191

Patch Availability(26)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-virtual-hwe-18.04-edge (5.4.0.126.127) @ focal	2026-05-25	ubuntu
ubuntu	linux-image-5.15.0-1018-kvm (5.15.0-1018.22) @ jammy	2026-05-25	ubuntu
ubuntu	linux-headers-lowlatency-64k-hwe-20.04-edge (5.15.0.48.54~20.04.16) @ focal	2026-05-25	ubuntu
ubuntu	linux-tools-5.15.0-1018-oracle (5.15.0-1018.23) @ jammy	2026-05-25	ubuntu
ubuntu	linux-modules-extra-gkeop-5.15 (5.15.0.1003.5) @ jammy	2026-05-25	ubuntu
ubuntu	linux-gcp-lts-20.04 (5.4.0.1089.94) @ focal	2026-05-25	ubuntu
ubuntu	linux-image-gcp-edge (5.4.0.1089.68) @ bionic	2026-05-25	ubuntu
ubuntu	linux-image-lowlatency (4.4.0.234.240) @ xenial	2026-05-25	ubuntu
ubuntu	linux-image-unsigned-5.15.0-1016-gke (5.15.0-1016.19) @ jammy	2026-05-25	ubuntu
ubuntu	linux-tools-5.15.0-1018-gcp (5.15.0-1018.24~20.04.1) @ focal	2026-05-25	ubuntu
ubuntu	linux-intel-iotg-headers-5.15.0-1016 (5.15.0-1016.21) @ jammy	2026-05-25	ubuntu
ubuntu	linux-headers-5.15.0-1016-gke (5.15.0-1016.19~20.04.1) @ focal	2026-05-25	ubuntu
ubuntu	linux-headers-azure-fde (5.4.0.1091.96+cvm1.31) @ focal	2026-05-25	ubuntu
ubuntu	linux-image-5.4.0-1070-raspi (5.4.0-1070.80~18.04.1) @ bionic	2026-05-25	ubuntu
ubuntu	linux-headers-gke-5.4 (5.4.0.1083.91) @ focal	2026-05-25	ubuntu
ubuntu	linux-image-4.15.0-1151-azure (4.15.0-1151.166~16.04.1) @ xenial	2026-05-25	ubuntu
ubuntu	linux-image-unsigned-5.15.0-1015-ibm (5.15.0-1015.17) @ jammy	2026-05-25	ubuntu
ubuntu	linux-oem-5.14-tools-host (5.14.0-1049.56) @ focal	2026-05-25	ubuntu
ubuntu	linux-cloud-tools-4.4.0-1150-aws (4.4.0-1150.165) @ xenial	2026-05-25	ubuntu
ubuntu	linux-buildinfo-4.15.0-1136-gcp (4.15.0-1136.152~16.04.1) @ xenial	2026-05-25	ubuntu
ubuntu	linux-tools-oem-22.04 (5.17.0.1016.15) @ jammy	2026-05-25	ubuntu
redhat	kernel-0:4.18.0-372.93.1.el8_6	2024-02-21	redhat
redhat	kernel-0:4.18.0-477.10.1.el8_8	2023-05-16	redhat
redhat	kernel-rt-0:4.18.0-477.10.1.rt7.274.el8_8	2023-05-16	redhat
redhat	kernel-0:5.14.0-284.11.1.el9_2	2023-05-09	redhat
redhat	kernel-rt-0:5.14.0-284.11.1.rt14.296.el9_2	2023-05-09	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-787Out-of-bounds Write

All Vendor Advisories

(25)

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)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-33655?

CVE-2021-33655 is a medium vulnerability published on July 18, 2022. When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.

When was CVE-2021-33655 disclosed?

CVE-2021-33655 was first published in the National Vulnerability Database on July 18, 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-2021-33655 actively exploited?

CVE-2021-33655 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-33655?

CVE-2021-33655 has a CVSS v3 base score of 6.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8.

How do I remediate CVE-2021-33655?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33655, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-33655

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CVE-2021-33655

Published

Last Modified

References (8)

Patch Availability(26)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33655?

Same vendor

Same CWE

CVE-2021-33655

📅 Published

🔄 Last Modified

🔗 References (8)

Patch Availability(26)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33655?

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References (8)

Frequently asked(5)

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