Home/CVE/An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users
CVE

CVE-2021-4157

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw to crash the system or escalate privileges on the system.

HIGH · CVSS 8 EPSS 0.00055
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
▤

Affected Products & Versions

17
linux kernel>= 4.0 and < 4.4.269
linux kernel>= 4.5 and < 4.9.269
linux kernel>= 4.10 and < 4.14.233
linux kernel>= 4.15 and < 4.19.191
linux kernel>= 4.20 and < 5.4.120
linux kernel>= 5.5 and < 5.10.38
linux kernel>= 5.11 and < 5.11.22
linux kernel>= 5.12 and < 5.12.5
▣

Scoring & Timeline

8
HIGH · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Mar 2022 · 07:15 PM
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

19
rhsaRHSA-2022:1988Low
rhsaRHSA-2022:1975Moderate
suse-csafSUSE-SU-2022:2809-1
suse-csafSUSE-SU-2022:2629-1
suse-csafopenSUSE-SU-2022:2549-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=2034342Issue TrackingThird Party Advisory
https://lore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/
https://security.netapp.com/advisory/ntap-20220602-0007/Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
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