CVE-2021-4090

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Summary

CVECVE-2021-4090
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-02-18 18:15:10 UTC
Updated2026-05-12 10:16:37 UTC
DescriptionAn out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.000710000 probability, percentile 0.215480000 (date 2026-05-12)

Problem Types: CWE-787 | CWE-787 CWE-787

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
2.0[email protected]Primary6.6AV:L/AC:L/Au:N/C:C/I:C/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
None

AV:L/AC:L/Au:N/C:C/I:C/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 5.16 - All All
Operating System Linux Linux Kernel 5.16 rc1 All All
Hardware Netapp H300e - All All All
Operating System Netapp H300e Firmware - All All All
Hardware Netapp H300s - All All All
Operating System Netapp H300s Firmware - All All All
Hardware Netapp H410c - All All All
Operating System Netapp H410c Firmware - All All All
Hardware Netapp H410s - All All All
Operating System Netapp H410s Firmware - All All All
Hardware Netapp H500e - All All All
Operating System Netapp H500e Firmware - All All All
Hardware Netapp H500s - All All All
Operating System Netapp H500s Firmware - All All All
Hardware Netapp H700e - All All All
Operating System Netapp H700e Firmware - All All All
Hardware Netapp H700s - All All All
Operating System Netapp H700s Firmware - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Kernel affected kernel 5.16 rc2 Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
CVE-2021-4090 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
2025101 – (CVE-2021-4090) CVE-2021-4090 kernel: Overflow of bmval[bmlen-1] in nfsd4_decode_bitmap function af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
[PATCH v1] NFSD: Fix exposure in nfsd4_decode_bitmap() - Chuck Lever af854a3a-2127-422b-91ae-364da2661108 lore.kernel.org
[PATCH v1] NFSD: Fix exposure in nfsd4_decode_bitmap() - Chuck Lever MITRE lore.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 182160 Debian Security Update for linux (CVE-2021-4090)
  • 198624 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5217-1)
  • 198653 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5265-1)
  • 198728 Ubuntu Security Notification for Linux kernel (Intel IOTG) Vulnerabilities (USN-5362-1)
  • 900694 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8678)
  • 901154 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8654-1)
  • 906175 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8678-1)
  • 906459 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8654-2)
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