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Message-ID: <2025070324-CVE-2025-38111-8e9a@gregkh> Date: Thu, 3 Jul 2025 10:35:28 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38111: net/mdiobus: Fix potential out-of-bounds read/write access From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: net/mdiobus: Fix potential out-of-bounds read/write access When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats array, where wrong address may allow out-of-bounds read/write. Fix that by adding address verification before read/write operation. While this excludes this access from any statistics, it improves security of read/write operation. The Linux kernel CVE team has assigned CVE-2025-38111 to this issue. Affected and fixed versions =========================== Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 5.10.239 with commit 19c5875e26c4ed5686d82a7d8f7051385461b9eb Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 5.15.186 with commit 014ad9210373d2104f6ef10e6bb999a7a0a4c50e Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 6.1.142 with commit 73d478234a619f3476028cb02dee699c30ae8262 Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 6.6.94 with commit bab6bca0834cbb5be2a7cfe59ec6ad016ec72608 Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 6.12.34 with commit b02d9d2732483e670bc34cb233d28e1d43b15da4 Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 6.15.3 with commit 049af7ac45a6b407748ee0995278fd861e36df8f Issue introduced in 5.6 with commit 080bb352fad00d04995102f681b134e3754bfb6e and fixed in 6.16-rc2 with commit 0e629694126ca388916f059453a1c36adde219c4 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-38111 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/net/phy/mdio_bus.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/19c5875e26c4ed5686d82a7d8f7051385461b9eb https://git.kernel.org/stable/c/014ad9210373d2104f6ef10e6bb999a7a0a4c50e https://git.kernel.org/stable/c/73d478234a619f3476028cb02dee699c30ae8262 https://git.kernel.org/stable/c/bab6bca0834cbb5be2a7cfe59ec6ad016ec72608 https://git.kernel.org/stable/c/b02d9d2732483e670bc34cb233d28e1d43b15da4 https://git.kernel.org/stable/c/049af7ac45a6b407748ee0995278fd861e36df8f https://git.kernel.org/stable/c/0e629694126ca388916f059453a1c36adde219c4
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