CVE-2026-43053VulnerabilityPublished 2 May 2026Updated 24 Sep 2026

attr dabtree inactivation · xfs: close crash window

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-43053· High

Not known to be exploited · fixed in e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f : patch Microsoft soon.

Data as of 30 Oct 2026, 06:59 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f, b854e1c4eff3473b6d3a9ae74129ac5c48bc0b61, 190d54d1d42878fce8c735c2d9ac835725694d3a +1

Exploitation evidence

Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

microsoft-security-response-ce

What to do

Upgrade Linux to e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f, b854e1c4eff3473b6d3a9ae74129ac5c48bc0b61, 190d54d1d42878fce8c735c2d9ac835725694d3a or 7ea3850b9ce005e70f502b308edb2d99ca074ed3.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f	Fixed in e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b854e1c4eff3473b6d3a9ae74129ac5c48bc0b61	Fixed in b854e1c4eff3473b6d3a9ae74129ac5c48bc0b61
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 190d54d1d42878fce8c735c2d9ac835725694d3a	Fixed in 190d54d1d42878fce8c735c2d9ac835725694d3a
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7ea3850b9ce005e70f502b308edb2d99ca074ed3	Fixed in 7ea3850b9ce005e70f502b308edb2d99ca074ed3
LinuxLinux	Affected =2.6.12	Fixed in–

Description

CVE-2026-43053 is a vulnerability in Microsoft software related to the xfs filesystem, specifically addressing a crash window in attribute dabtree inactivation. The affected version explicitly identified is version 3.0. No CVSS score is provided for this vulnerability. There is no information about known exploits in the wild or available patches.

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
Implementation
The most basic advice for TOCTOU vulnerabilities is to not perform a check before the use. This does not resolve the underlying issue of the execution of a function on a resource whose state and identity cannot be assured, but it does help to limit the false sense of security given by the check.
Implementation
When the file being altered is owned by the current user and group, set the effective gid and uid to that of the current user and group when executing this statement.
Architecture and Design
Limit the interleaving of operations on files from multiple processes.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V1.11.3 (opens in a new tab)
V11.1.6 (opens in a new tab)
V1.11.2 (opens in a new tab)
Attack patterns
Leveraging Race Conditions via Symbolic Links (opens in a new tab)
Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jun 2026, 22:57 UTC

WeaknessesCWE-367

Technical details

References

Community reviews

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