Security readout for executives and security teams
This is a local denial-of-service flaw in illumos tmpfs and related Solaris-family systems. A logged-in, unprivileged user could trigger a kernel deadlock and panic, causing an outage. It does not indicate data theft or remote compromise in the provided sources. Exposure is mainly multi-user Unix/Solaris environments where untrusted or semi-trusted local users can write to tmpfs. Internet-facing status alone is not enough; the attacker needs local privileges. Shared hosting, shell servers, CI workers, labs, and legacy Solaris estates are higher concern. Treat as a moderate availability risk. Patch promptly on shared or business-critical Solaris-family systems, especially where local users or workloads are not fully trusted. It is less urgent for isolated single-user systems with no untrusted local access. Mitigation focus: Apply vendor updates for affected illumos-derived distributions and Oracle Solaris.; For illumos builds, confirm inclusion of commit f859e7171bb5db34321e45585839c6c3200ebb90 or a downstream fix.; Follow Oracle CPU January 2022 guidance for Solaris 10 and 11..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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Open ATT&CK lookupCVE-2021-43395 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/illumos/illumos-gate/blob/069654420de4aade43c63c43cd2896e66945fc8a/usr/src/uts/common/fs/tmpfs/tmp_vnops.cCVE reference
- https://github.com/illumos/illumos-gate/blob/b3403853e80914bd0aade9b5b605da4878078173/usr/src/uts/common/fs/tmpfs/tmp_dir.cCVE reference
- https://www.oracle.com/security-alerts/cpujan2022.htmlCVE reference
- https://jgardner100.wordpress.com/2022/01/20/security-heads-up/CVE reference
- https://illumos.topicbox.com/groups/developer/T1c9e4f27f8c2f959/security-heads-up-illumos14424CVE reference
- https://www.illumos.org/issues/14424CVE reference
- https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90CVE reference
- https://kebe.com/blog/?p=505CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Locking
Improper Locking represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.