CVE-2021-43395

Name: CVE-2021-43395
Creator: NVD / NIST
Published: 2022-12-26T06:15:10.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2021-43395 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An issue was discovered in illumos before f859e7171bb5db34321e45585839c6c3200ebb90, OmniOS Community Edition r151038, OpenIndiana Hipster 2021.04, and SmartOS 20210923. A local unprivileged user can cause a deadlock and kernel panic via crafted rename and rmdir calls on tmpfs filesystems. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

An issue was discovered in illumos before f859e7171bb5db34321e45585839c6c3200ebb90, OmniOS Community Edition r151038, OpenIndiana Hipster 2021.04, and SmartOS 20210923. A local unprivileged user can cause a deadlock and kernel panic via crafted rename and rmdir calls on tmpfs filesystems. Oracle Solaris 10 and 11 is also affected.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.32%

23.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Illumos	Illumos	< 2022-01-18
Omniosce	Omnios	r151038
Openindiana	Openindiana	hipster_2021.04
Joyent	Smartos	20210923
Oracle	Solaris	10
Oracle	Solaris	11

References

http://www.tribblix.org/relnotes.htmlRelease Notes, Third Party Advisory
https://github.com/illumos/illumos-gate/blob/069654420de4aade43c63c43cd2896e66945fc8a/usr/src/uts/common/fs/tmpfs/tmp_vnops.cExploit, Third Party Advisory
https://github.com/illumos/illumos-gate/blob/b3403853e80914bd0aade9b5b605da4878078173/usr/src/uts/common/fs/tmpfs/tmp_dir.cExploit, Third Party Advisory
https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90Patch, Third Party Advisory
https://illumos.topicbox.com/groups/developer/T1c9e4f27f8c2f959/security-heads-up-illumos14424Vendor Advisory
https://jgardner100.wordpress.com/2022/01/20/security-heads-up/Third Party Advisory
https://kebe.com/blog/?p=505Third Party Advisory
https://www.illumos.org/issues/14424Issue Tracking, Patch, Vendor Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
http://www.tribblix.org/relnotes.htmlRelease Notes, Third Party Advisory
https://github.com/illumos/illumos-gate/blob/069654420de4aade43c63c43cd2896e66945fc8a/usr/src/uts/common/fs/tmpfs/tmp_vnops.cExploit, Third Party Advisory
https://github.com/illumos/illumos-gate/blob/b3403853e80914bd0aade9b5b605da4878078173/usr/src/uts/common/fs/tmpfs/tmp_dir.cExploit, Third Party Advisory
https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90Patch, Third Party Advisory
https://illumos.topicbox.com/groups/developer/T1c9e4f27f8c2f959/security-heads-up-illumos14424Vendor Advisory
https://jgardner100.wordpress.com/2022/01/20/security-heads-up/Third Party Advisory
https://kebe.com/blog/?p=505Third Party Advisory
https://www.illumos.org/issues/14424Issue Tracking, Patch, Vendor Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory

Timeline

Published: Dec 26, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43395?

How severe is CVE-2021-43395?

CVE-2021-43395 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43395?

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-2021-43395?

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

Scan your code now

Source: NVD / NIST