HIGH 7.8 Microsoft ACTIVELY EXPLOITED PoC

CVE-2026-46300

net: skbuff: preserve shared-frag marker during coalescing

Microsoft Security Update 2026-May: net: skbuff: preserve shared-frag marker during coalescing

Affected Products

References

Published: 2026-05-12 · Source: Microsoft · Feed updated: 2026-11-02
This high severity vulnerability with a CVSS score of 7.8 was published on 2026-05-12 via Microsoft. ⚠ This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog — it is being actively exploited in the wild. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 16.1% (top 3% of all CVEs by exploitation probability). Affected: azl3 kernel 6.6.139.1-1 on Azure Linux 3.0.

Risk Timeline

CVE Disclosed2026-05-12 · 173 days ago
Public PoC Exploit AvailableWeaponised proof-of-concept code is publicly accessible
CISA KEV — Actively ExploitedU.S. federal agencies required to patch · confirmed threat-actor activity

Remediation Resources

Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46300
NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-46300

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