CVE-2021-43395
CVE-2021-43395 is a medium-severity vulnerability in Illumos with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-667.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- EPSS exploit prediction: 0% (24th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-667
- Affected product: Illumos
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-43395?
- 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.
- How severe is CVE-2021-43395?
- CVE-2021-43395 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-43395 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-43395?
- CVE-2021-43395 primarily affects Illumos. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-43395?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-43395 published?
- CVE-2021-43395 was published on 2022-12-26 and last updated on 2026-06-17.
References
- http://www.tribblix.org/relnotes.html
- https://github.com/illumos/illumos-gate/blob/069654420de4aade43c63c43cd2896e66945fc8a/usr/src/uts/common/fs/tmpfs/tmp_vnops.c
- https://github.com/illumos/illumos-gate/blob/b3403853e80914bd0aade9b5b605da4878078173/usr/src/uts/common/fs/tmpfs/tmp_dir.c
- https://github.com/illumos/illumos-gate/commit/f859e7171bb5db34321e45585839c6c3200ebb90
- https://illumos.topicbox.com/groups/developer/T1c9e4f27f8c2f959/security-heads-up-illumos14424
- https://jgardner100.wordpress.com/2022/01/20/security-heads-up/
- https://kebe.com/blog/?p=505
- https://www.illumos.org/issues/14424
- https://www.oracle.com/security-alerts/cpujan2022.html
Affected products (6)
- cpe:2.3:o:illumos:illumos:*:*:*:*:*:*:*:*
- cpe:2.3:o:omniosce:omnios:r151038:*:*:*:community:*:*:*
- cpe:2.3:o:openindiana:openindiana:hipster_2021.04:*:*:*:*:*:*:*
- cpe:2.3:o:joyent:smartos:20210923:*:*:*:*:*:*:*
- cpe:2.3:o:oracle:solaris:10:*:*:*:*:*:*:*
- cpe:2.3:o:oracle:solaris:11:*:*:*:*:*:*:*
More vulnerabilities in Illumos
- CVE-2020-27678 — Critical (CVSS 9.8): An issue was discovered in illumos before 2020-10-22, as used in OmniOS before r151030by, r151032ay, and r151034y and…
- CVE-2016-6560 — High (CVSS 8.6): illumos osnet-incorporation bcopy() and bzero() implementations make signed instead of unsigned comparisons allowing a…
- CVE-2019-9579 — High (CVSS 8.1): An issue was discovered in Illumos in Nexenta NexentaStor 4.0.5 and 5.1.2, and other products. The SMB server allows an…
- CVE-2016-6561 — High (CVSS 7.5): illumos smbsrv NULL pointer dereference allows system crash.
- CVE-2012-0217 — High (CVSS 7.2): The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix XenServer 6.0.2 and earlier and…
- CVE-2014-9491 — Medium (CVSS 5.0): The devzvol_readdir function in illumos does not check the return value of a strchr call, which allows remote attackers…
Other CWE-667 (Improper Locking) vulnerabilities
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- CVE-2019-5886 — Critical (CVSS 9.8): An issue was discovered in ShopXO 1.2.0. In the application\install\controller\Index.php file, there is no validation…
- CVE-2026-43215 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: cifs: Fix locking usage for tcon fields We used…
- CVE-2026-31629 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED…
- CVE-2020-15674 — High (CVSS 8.8): Mozilla developers reported memory safety bugs present in Firefox 80. Some of these bugs showed evidence of memory…
- CVE-2021-1622 — High (CVSS 8.6): A vulnerability in the Common Open Policy Service (COPS) of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband…