CVE-2021-4090

Aliases:DEBIAN-CVE-2021-4090
Advisory lineage Upstream: 0 Downstream: 5
Modified
Published: 18 Feb 2022, 00:00
Last modified:25 Aug 2026, 18:25

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
v3.1 (nvd)
EPSS Score
0.34% LOW
0% probability +0.28%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Feb 2022, 00:00
Published
Vulnerability first disclosed
25 Aug 2026, 18:25
Last Modified
Vulnerability information updated

Description

An 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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
  • v2.0•MEDIUM•Score: 6.6AV:L/AC:L/Au:N/C:C/I:C/A:N

EPSS Trends

Current EPSS score: 0.34%• Percentile: 27%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • debian•linux

    < 5.15.5-1 | < 5.15.5-1 | < 5.15.5-1

  • linux•kernel

    ≥ 5.11, < 5.15.5

  • linux•linux_kernel

    < 5.16 | 5.16 | 5.16:rc1

  • netapp•h300e_firmware

    na

  • netapp•h300s_firmware

    na

  • netapp•h410c_firmware

    na

  • netapp•h410s_firmware

    na

  • netapp•h500e_firmware

    na

  • netapp•h500s_firmware

    na

  • netapp•h700e_firmware

    na

  • netapp•h700s_firmware

    na

References (6)