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cve 2025 40305

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CVE-2025-40305 is a Linux kernel vulnerability in the 9P transport layer that could cause write path hangs when pipes become full. The issue stems from a scheduling bug where the receive worker is not reliably awakened on EPOLLIN conditions. A regression fix replaces a narrow EPOLLOUT-only check with a full poll multiplex invocation to restore proper RX wakeups. This vulnerability affects systems using the Plan 9 (9P) protocol, commonly exposed as v9fs/9p in virtualized environments. The fix has been landed by Linux kernel maintainers to address the hang condition.
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    Linux 9P Regression Fix CVE-2025-40305 Restores RX Wakeups

    Linux kernel maintainers have landed a focused regression fix for a 9P transport scheduling bug cataloged as CVE-2025-40305 that could hang 9P write paths when pipes become full; the short technical solution replaces a narrow EPOLLOUT-only check with a full poll multiplex invocation so the...
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    • cve 2025 40305 kernel backport linux kernel ninep transport
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    • Forum: Security Alerts
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