What’s Vulnerable › Vulnerabilities

CVE-2021-4157

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-25 · updated 2026-06-17
• Weakness: CWE-119

Description

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.

Affected products

• Fedoraproject Fedora: 35
• Linux kernel: from 4.0 before 4.4.269; from 4.5 before 4.9.269; from 4.10 before 4.14.233; from 4.15 before 4.19.191; from 4.20 before 5.4.120; from 5.5 before 5.10.38 — fixed in 4.14.233, 4.19.191, 4.4.269, 4.9.269, 5.10.38, 5.11.22
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• Oracle Communications Cloud Native Core Binding Support Function: 22.1.1, 22.1.3, 22.2.0

How to fix

Upgrade to a fixed version: Linux kernel 4.14.233, 4.19.191, 4.4.269, 4.9.269. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2034342
• https://lore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/
• https://security.netapp.com/advisory/ntap-20220602-0007/
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://bugzilla.redhat.com/show_bug.cgi?id=2034342
• https://lore.kernel.org/lkml/20210517140244.822185482%40linuxfoundation.org/
• https://security.netapp.com/advisory/ntap-20220602-0007/
• https://www.oracle.com/security-alerts/cpujul2022.html

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