What is CVE-2021-4157?

CVE-2021-4157 is a high-severity vulnerability in Linux Linux_kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.0/10. Published 2022-03-25.

How severe is CVE-2021-4157?

High severity. CVSS v3 base score is 8.0 out of 10.

Is CVE-2021-4157 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Linux Linux_kernel

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 use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw…

Vulnerability class: Buffer Overflow

EPSS: 0.016 (72.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

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

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
secalert@redhat.com (x_refsource_MISC)
secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2021-4157?: CVE-2021-4157 is a high-severity vulnerability in Linux Linux_kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.0/10. Published 2022-03-25.
How severe is CVE-2021-4157?: High severity. CVSS v3 base score is 8.0 out of 10.
Is CVE-2021-4157 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.