Skip to main content

Early Access — Mondoo Vulnerability Intelligence is currently in preview.

Mondoo Vulnerability Intelligence

Curated by Mondoo Research, enhanced with AI

Resources

Search Vulnerabilities
Trending CVEs
Browse Ecosystems
Terminology
Blog

Open Source

cnquery
cnspec

Star us on GitHub!

Company

Mondoo Platform
About
Contact

© 2026 Mondoo, Inc.

Privacy Policy Terms of Service Imprint

Vulnerability Intelligence

CVE-2021-33909 | Mondoo Vulnerability Intelligence

CVE-2021-33909

HIGH7.8

fs/seq_file

Published Jul 20, 2021

Modified 1 years ago

No fix available

Details

fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.

References

WEBhttp://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html WEBhttp://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html WEBhttp://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html WEBhttp://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html WEBhttp://www.openwall.com/lists/oss-security/2021/07/22/7 WEBhttp://www.openwall.com/lists/oss-security/2021/08/25/10 WEBhttp://www.openwall.com/lists/oss-security/2021/09/17/2 WEBhttp://www.openwall.com/lists/oss-security/2021/09/17/4 WEBhttp://www.openwall.com/lists/oss-security/2021/09/21/1 WEBhttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4 WEBhttps://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b WEBhttps://lists.debian.org/debian-lts-announce/2021/07/msg00014.html WEBhttps://lists.debian.org/debian-lts-announce/2021/07/msg00015.html WEBhttps://lists.debian.org/debian-lts-announce/2021/07/msg00016.html ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/WEBhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015 WEBhttps://security.netapp.com/advisory/ntap-20210819-0004/ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2021-33909 ADVISORYhttps://www.debian.org/security/2021/dsa-4941 WEBhttps://www.openwall.com/lists/oss-security/2021/07/20/1 WEBhttps://www.oracle.com/security-alerts/cpujan2022.html

CVSS Analysis

CVSS v3.1

7.8

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

7.8/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Ecosystems

Timeline

PublishedJul 20, 2021

ModifiedAug 4, 2024