CVE-2021-45868

Name: CVE-2021-45868
Creator: NVD / NIST
Published: 2022-03-18T07:15:06.597+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2021-45868 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can, for example, lead to a kernel/locking/rwsem.c use-after-free if there is a corrupted quota file.. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can, for example, lead to a kernel/locking/rwsem.c use-after-free if there is a corrupted quota file.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.15.3
Netapp	H300s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H300e Firmware	All versions
Netapp	H500e Firmware	All versions
Netapp	H700e Firmware	All versions
Netapp	H410s Firmware	All versions
Netapp	H410c Firmware	All versions
Netapp	H500s Firmware	All versions

References

https://bugzilla.kernel.org/show_bug.cgi?id=214655Exploit, Issue Tracking, Vendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3Mailing List, Release Notes, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050Mailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220419-0003/Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/03/17/1Exploit, Mailing List, Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/03/17/2Exploit, Mailing List, Patch, Third Party Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=214655Exploit, Issue Tracking, Vendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3Mailing List, Release Notes, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050Mailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20220419-0003/Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/03/17/1Exploit, Mailing List, Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/03/17/2Exploit, Mailing List, Patch, Third Party Advisory

Timeline

Published: Mar 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-45868?

How severe is CVE-2021-45868?

CVE-2021-45868 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-45868?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-45868?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST