CVE-2026-43036VulnerabilityPublished 2 May 2026Updated 24 Sep 2026

Microsoft · net: use skb_header_pointer() for TCPv4 GSO frag_off check

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-43036· Low

Not known to be exploited · fixed in f7a6cd508e9e825a2c69fa9e13d41ee156852f25 : update Microsoft when convenient.

Data as of 30 Oct 2026, 06:59 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 f7a6cd508e9e825a2c69fa9e13d41ee156852f25, ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0, d970341cfa5594614c7a6634886c7688b4f5cafd +2

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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cbc53e08a793b073e79f42ca33f1f3568703540d, < f7a6cd508e9e825a2c69fa9e13d41ee156852f25	Fixed in f7a6cd508e9e825a2c69fa9e13d41ee156852f25
LinuxLinux	Affected ≥ cbc53e08a793b073e79f42ca33f1f3568703540d, < ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0	Fixed in ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0
LinuxLinux	Affected ≥ cbc53e08a793b073e79f42ca33f1f3568703540d, < d970341cfa5594614c7a6634886c7688b4f5cafd	Fixed in d970341cfa5594614c7a6634886c7688b4f5cafd
LinuxLinux	Affected ≥ cbc53e08a793b073e79f42ca33f1f3568703540d, < cc91202fc20a44aab4c206f12a2bfe05da936051	Fixed in cc91202fc20a44aab4c206f12a2bfe05da936051
LinuxLinux	Affected ≥ cbc53e08a793b073e79f42ca33f1f3568703540d, < 5057502630fbc8ce468ff617ff59af275960b537	Fixed in 5057502630fbc8ce468ff617ff59af275960b537
LinuxLinux	Affected =4.7	Fixed in–

Description

CVE-2026-43036 is a vulnerability related to the net subsystem involving the use of skb_header_pointer() for TCPv4 GSO frag_off check. The information provided is minimal and does not include technical details about the nature of the vulnerability or its impact. The affected version explicitly stated is version 3.0. There is no CVSS score or detailed vendor advisory available to clarify the severity or remediation status.

Impact

Due to the lack of detailed information, the precise impact cannot be determined. The vulnerability involves TCPv4 packet processing, which could potentially affect network communication integrity or stability, but no explicit impact statements or exploit evidence are provided.

Summary

This vulnerability concerns the network code handling TCPv4 Generic Segmentation Offload (GSO) fragment offset checks, specifically involving the use of skb_header_pointer(). The exact impact, exploitation method, and technical details are not provided. The affected product is from Microsoft, with version 3.0 explicitly noted as affected.

CWE-908Use of Uninitialized Resource (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product uses or accesses a resource that has not been initialized.
Implementation
Explicitly initialize the resource before use. If this is performed through an API function or standard procedure, follow all required steps.
Implementation
Pay close attention to complex conditionals that affect initialization, since some branches might not perform the initialization.
Implementation
Avoid race conditions (CWE-362) during initialization routines.
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-908

Technical details

References

Community reviews

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