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CVE-2025-39905: net: phylink: add lock for serializing concurrent pl->phydev writes with resolver

highCVSS 7.1CVE-2025-39905

CSIRTS triage

vendor: Linuxproduct: Linux KernelMemory corruption
What
The phylink networking component lacks proper locking for concurrent writes to pl->phydev, causing race condition vulnerabilities.
Who is affected
Systems with phylink-based network drivers in use, particularly those with concurrent device access patterns.
Urgency
High priority; CVSS 7.1 indicates significant impact from race condition exploitation without proper locking.
Action
Apply the kernel patch that adds serialization lock for concurrent pl->phydev write operations.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.1
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39905

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-39905coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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