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CVE-2025-38086 is an uninitialized-memory access vulnerability in the Linux kernel's CH9200 network driver. During mii_nway_restart(), the MDIO read callback invokes ch9200_mdio_read(), which relies on control_read() to initialize a local buffer. control_read() copies data into that buffer only when the transfer returns the requested number of bytes. Because ch9200_mdio_read() ignores the return value, a failed or unexpected-length transfer leaves the buffer uninitialized, but the function still reads two bytes and returns a value derived from them.
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An uninitialized-memory access vulnerability in the Linux kernel's ch9200 network driver. If control_read() fails or returns an unexpected length, ch9200_mdio_read() accesses an uninitialized buffer because it does not check the return value. The fix checks that value and returns early on error. The advisory assigns a CVSS v3 score of 5.5, indicating local exploitation requiring low privileges and a high availability impact.
An uninitialized-access vulnerability in the Linux kernel ch9200 network driver during mii_nway_restart, affecting Rocky Linux 9 kernel packages covered by CIQ advisory crlsa-2025_11861.
An uninitialized-access vulnerability in the Linux kernel's ch9200 network driver during mii_nway_restart. Red Hat addresses it in Important-rated advisory RHSA-2025:12662. The kernel update requires a reboot.
An uninitialized-memory access flaw in the Linux kernel CH9200 network driver during mii_nway_restart.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.