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CVE-2021-43395

MEDIUM
5.5
CVSS Score
Published: December 26, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 04:10 AM UTC
5 products affected across 5 vendorsSolarisSmartOSIllumos

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Illumos· Illumos
95%
v < 2022-01-18
Affected range stops below 2022-01-18, so it looks safe — our inference, not a vendor statement
SmartOS· Joyent
95%
20210923
Omnios· Omniosce
95%
r151038
Openindiana· Openindiana
95%
hipster_2021.04
Solaris· Oraclerubygems
95%
1011

References (9)

Release NotesThird Party Advisory
Source: [email protected]
http://www.tribblix.org/relnotes.html
ExploitThird Party Advisory
Source: [email protected]
https://github.com/illumos/illumos-gate/blob/069654420de4aade43c63c43cd2896e66945fc8a/usr/src/uts/common/fs/tmpfs/tmp_vnops.c
ExploitThird Party Advisory
Source: [email protected]
https://github.com/illumos/illumos-gate/blob/b3403853e80914bd0aade9b5b605da4878078173/usr/src/uts/common/fs/tmpfs/tmp_dir.c
PatchThird Party Advisory
Source: [email protected]
https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90
Vendor Advisory
Source: [email protected]
https://illumos.topicbox.com/groups/developer/T1c9e4f27f8c2f959/security-heads-up-illumos14424
Third Party Advisory
Source: [email protected]
https://jgardner100.wordpress.com/2022/01/20/security-heads-up/
Third Party Advisory
Source: [email protected]
https://kebe.com/blog/?p=505
Issue TrackingPatchVendor Advisory
Source: [email protected]
https://www.illumos.org/issues/14424

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-667

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