high
7.1
CWE
787
Advisory Published
CVE Published
Updated

CVE-2021-4090

First published: Fri Nov 19 2021(Updated: )

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, and write leading to a system integrity and confidentiality threat. Upstream discussion: <a href="https://lore.kernel.org/linux-nfs/97860.1636837122@crash.local/">https://lore.kernel.org/linux-nfs/97860.1636837122@crash.local/</a> <a href="https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit@klimt.1015granger.net/">https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit@klimt.1015granger.net/</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<5.16
5.16
Linux Kernel<5.16
Linux Kernel=5.16
Linux Kernel=5.16-rc1
All of
NetApp H300S Firmware
NetApp H300S Firmware
All of
NetApp H500e Firmware
NetApp H500e Firmware
All of
NetApp H700S
NetApp H700S
All of
NetApp H300E
NetApp H300E Firmware
All of
NetApp H500S Firmware
NetApp H500e Firmware
All of
NetApp H700E
NetApp H700E
All of
NetApp H410S
NetApp H410S Firmware
All of
NetApp H410C
NetApp H410C Firmware
NetApp H300S Firmware
NetApp H300S Firmware
NetApp H500e Firmware
NetApp H500e Firmware
NetApp H700S
NetApp H700S
NetApp H300E
NetApp H300E Firmware
NetApp H500S Firmware
NetApp H500e Firmware
NetApp H700E
NetApp H700E
NetApp H410S
NetApp H410S Firmware
NetApp H410C
NetApp H410C Firmware
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.128-1
6.12.20-1
6.12.21-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2025101

Remedy

https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit@klimt.1015granger.net/

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-4090?

    CVE-2021-4090 is classified as a high severity vulnerability due to its potential to allow local attackers to execute out-of-bounds memory writes.

  • How do I fix CVE-2021-4090?

    To mitigate CVE-2021-4090, update the Linux kernel to version 5.16 or later.

  • Who is affected by CVE-2021-4090?

    CVE-2021-4090 affects users of the Linux kernel versions prior to 5.16 and certain NetApp firmware.

  • What types of attacks can exploit CVE-2021-4090?

    An attacker can exploit CVE-2021-4090 to perform out-of-bounds memory writes, potentially leading to privilege escalation or data leakage.

  • What components are impacted by CVE-2021-4090?

    CVE-2021-4090 specifically affects the NFS server implementation in the Linux kernel.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203