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CVE-2021-4157

Good to know:

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Date: March 25, 2022

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.

Language: C

Severity Score

Related Resources (11)

https://access.redhat.com/security/cve/CVE-2021-4157
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4157
https://bugzilla.redhat.com/show_bug.cgi?id=2034342
https://lore.kernel.org/lkml/20210517140244.822185482@linuxfoundation.org/
https://nvd.nist.gov/vuln/detail/CVE-2021-4157
https://lore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/
https://www.oracle.com/security-alerts/cpujul2022.html
https://security-tracker.debian.org/tracker/CVE-2021-4157
https://security.netapp.com/advisory/ntap-20220602-0007/
https://github.com/torvalds/linux/commit/ed34695e15aba74f45247f1ee2cf7e09d449f925
https://www.mend.io/vulnerability-database/CVE-2021-4157

Severity Score

Weakness Type (CWE)

Buffer Errors

CWE-119

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): ADJACENT_NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): ADJACENT
Access Complexity (AC): MEDIUM
Authentication (AU): SINGLE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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