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CVE-2025-38086
published 2025-06-28

CVE-2025-38086: In the Linux kernel, the following vulnerability has been resolved: net: ch9200: fix uninitialised access during mii_nway_restart In mii_nway_restart() the…

medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
In the Linux kernel, the following vulnerability has been resolved: net: ch9200: fix uninitialised access during mii_nway_restart In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read(): if (err == size) { memcpy(data, buf, size); } If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read(): return (buff[0] | buff[1] << 8); The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff". To fix this we should check the return value of control_read() and return early on error.

Affected

37 ranges· showing 25
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
debianlinux-6.1< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
linuxlinux
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 119766de4930ff40db9f36b960cb53b0c400e81b119766de4930ff40db9f36b960cb53b0c400e81b
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 33163c68d2e3061fa3935b5f0a1867958b1cdbd233163c68d2e3061fa3935b5f0a1867958b1cdbd2
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9da3e442714f7f4393ff01c265c4959c03e88c2f9da3e442714f7f4393ff01c265c4959c03e88c2f
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9a350f30d65197354706b7759b5c89d6c267b1a99a350f30d65197354706b7759b5c89d6c267b1a9
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 6bd2569d0b2f918e9581f744df0263caf73ee76c6bd2569d0b2f918e9581f744df0263caf73ee76c
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 4da7fcc098218ff92b2e83a43f545c02f714cedd4da7fcc098218ff92b2e83a43f545c02f714cedd
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
linuxlinux>= 4a476bd6d1d923922ec950ddc4c27b279f6901eb < 9ad0452c0277b816a435433cca601304cfac7c219ad0452c0277b816a435433cca601304cfac7c21
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.244-15.10.244-1
linuxlinux_kernel>= 0 < 6.1.147-16.1.147-1
linuxlinux_kernel>= 0 < 6.12.35-16.12.35-1
linuxlinux_kernel>= 0 < 6.12.35-16.12.35-1
linuxlinux_kernel>= 0 < 5.15.0-156.1665.15.0-156.166
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 4.3.1 < 5.4.2955.4.295
linuxlinux_kernel>= 5.11 < 5.15.1865.15.186
linuxlinux_kernel>= 5.16 < 6.1.1426.1.142
linuxlinux_kernel>= 5.5 < 5.10.2395.10.239
linuxlinux_kernel>= 6.13 < 6.15.46.15.4
linuxlinux_kernel>= 6.2 < 6.6.956.6.95

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.6MEDIUM