CVE-2026-43244VulnerabilityPublished 7 May 2026Updated 24 Sep 2026

frag_list · kcm: fix zero-frag skb

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-43244· Low

Not known to be exploited · fixed in ca220141fa8ebae09765a242076b2b77338106b0 : update Microsoft when convenient.

Data as of 29 Oct 2026, 19:04 UTC

Severity

Low

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ca220141fa8ebae09765a242076b2b77338106b0, b1e3edf688a88c1a3ac41657055d9c136a08cd25, 9ea3671d70ee07480d80bebe86696397c4e99fb7 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 6 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < ca220141fa8ebae09765a242076b2b77338106b0	Fixed in ca220141fa8ebae09765a242076b2b77338106b0
LinuxLinux	Affected ≥ ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < b1e3edf688a88c1a3ac41657055d9c136a08cd25	Fixed in b1e3edf688a88c1a3ac41657055d9c136a08cd25
LinuxLinux	Affected ≥ ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < 9ea3671d70ee07480d80bebe86696397c4e99fb7	Fixed in 9ea3671d70ee07480d80bebe86696397c4e99fb7
LinuxLinux	Affected ≥ ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < 7af58f76e4b404a74c836881a845e6652db8a09f	Fixed in 7af58f76e4b404a74c836881a845e6652db8a09f
LinuxLinux	Affected ≥ ab7ac4eb9832e32a09f4e8042705484d2fb0aad3, < 6f129a251c2795ba55dd5cc1fdf7e0af3098d848	Fixed in 6f129a251c2795ba55dd5cc1fdf7e0af3098d848
LinuxLinux	Affected =4.6	Fixed in–

Description

CVE-2026-43244 is a vulnerability identified in Microsoft software version 3.0 related to the handling of zero-fragment socket buffers (skb) in the frag_list during partial sendmsg errors. The issue involves improper management of fragmented network packets which could potentially lead to unexpected behavior. No CVSS score is provided for this vulnerability. There are no known exploits in the wild at this time.

Impact

The impact details are not explicitly described in the available information. Without further technical details or vendor advisory, the exact consequences of this vulnerability remain unclear. No known exploits have been reported.

Summary

This vulnerability concerns the handling of zero-fragment socket buffers in the frag_list on partial sendmsg errors within Microsoft product version 3.0. The flaw could cause improper processing of fragmented network packets, but specific exploitation details or impact scenarios are not provided. The vendor has not published any patch or mitigation guidance as of the provided data.

CWE-401Missing Release of Memory after Effective Lifetime (opens in a new tab)
Variant weaknessLikelihood of exploit: Medium
The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
Implementation · Libraries or Frameworks
Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Architecture and Design · Build and Compilation
Consider using the Boehm-Demers-Weiser garbage collector (bdwgc), which can help avoid leaks.
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jun 2026, 22:54 UTC

WeaknessesCWE-401

Technical details

References

Community reviews

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