July 2026 Patch TuesdayMSRC-2026-07-open-source-software-release-notesNormal patch window

Microsoft · MSRC-2026-07-open-source-software-release-notes

Linked CVE review

Deploy Microsoft Open Source Software update for Windows Subsystem for Linux (WSL2)

Linked CVEs: 2
Confirmed exploited: 0
PoC or lab evidence: 0
Maximum CVSS: 7.8

Evidence is kept separate

Confirmed exploitation, public exploit material, EPSS probability and CVSS severity answer different questions. “No confirmation recorded” means the checked sources do not currently confirm exploitation. It is not proof that exploitation has not occurred.

2 of 2 linked CVEs shown

Confirmed exploitedCVSS above 9.0

CVE and description	Severity	Exploit reality	Forecast and access	Remediation
CVE-2026-57968 Scheduled assessment Windows Subsystem for Linux (WSL2) Kernel Elevation of Privilege Vulnerability Buffer over-read in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.	7.8 · CVSS 3.1 · HighSource: CNA	No confirmation recordedNo CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.None recordedNo exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.	EPSS: 0.33% · 24.6th percentileForecast date: 2026-10-07LOCAL · LOW complexity · LOW privileges · NONE user interaction	Within 7 daysHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.Awaiting fix. No fixed version is explicitly recorded in the structured CVE data.
CVE-2026-57973 Scheduled assessment Windows Subsystem for Linux (WSL2) Kernel Tampering Vulnerability Time-of-check time-of-use (toctou) race condition in Windows Subsystem for Linux allows an authorized attacker to perform tampering locally.	6.3 · CVSS 3.1 · MediumSource: CNA	No confirmation recordedNo CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.None recordedNo exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.	EPSS: 0.22% · 11.1th percentileForecast date: 2026-10-07LOCAL · HIGH complexity · LOW privileges · NONE user interaction	ScheduledMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.Awaiting fix. No fixed version is explicitly recorded in the structured CVE data.