UBUNTU-CVE-2021-4090

Advisory lineage Upstream: 1 Downstream: 3
Upstream
CVE-2021-4090
Published: 13 Dec 2021, 00:00
Last modified:04 Feb 2026, 02:47

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

13 Dec 2021, 00:00
Published
Vulnerability first disclosed
04 Feb 2026, 02:47
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

Affected Systems

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    < 5.11.0-1028.31~20.04.1

  • ubuntu•linux-aws-5.13

    < 5.13.0-1012.13~20.04.1

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-azure

    all

  • ubuntu•linux-azure-5.11

    < 5.11.0-1028.31~20.04.2

  • ubuntu•linux-azure-5.13

    < 5.13.0-1013.15~20.04.1

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-gcp

    all

  • ubuntu•linux-gcp-5.11

    < 5.11.0-1029.33~20.04.3

  • ubuntu•linux-gcp-5.13

    < 5.13.0-1013.16~20.04.1

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-hwe

    all

  • ubuntu•linux-hwe-5.11

    all

  • ubuntu•linux-hwe-5.13

    < 5.13.0-28.31~20.04.1

  • ubuntu•linux-hwe-5.8

    all

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-5.13

    < 5.13.0-1010.10

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.13

    < 5.13.0-1029.36

  • ubuntu•linux-oem-5.14

    < 5.14.0-1018.19

  • ubuntu•linux-oem-5.6

    all

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.11

    < 5.11.0-1028.31~20.04.1

  • ubuntu•linux-oracle-5.13

    < 5.13.0-1016.20~20.04.1

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.8

    all

  • ubuntu•linux-raspi2

    all

  • ubuntu•linux-riscv

    all

  • ubuntu•linux-riscv-5.11

    all

  • ubuntu•linux-riscv-5.8

    all

References (8)