cbcvebase.
CVE-2025-40120
published 2025-11-12

CVE-2025-40120: In the Linux kernel, the following vulnerability has been resolved: net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock Prevent USB runtime PM…

PriorityP423high7.8
EPSS
0.20%
10.3th percentile
In the Linux kernel, the following vulnerability has been resolved: net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock Prevent USB runtime PM (autosuspend) for AX88772* in bind. usbnet enables runtime PM (autosuspend) by default, so disabling it via the usb_driver flag is ineffective. On AX88772B, autosuspend shows no measurable power saving with current driver (no link partner, admin up/down). The ~0.453 W -> ~0.248 W drop on v6.1 comes from phylib powering the PHY off on admin-down, not from USB autosuspend. The real hazard is that with runtime PM enabled, ndo_open() (under RTNL) may synchronously trigger autoresume (usb_autopm_get_interface()) into asix_resume() while the USB PM lock is held. Resume paths then invoke phylink/phylib and MDIO, which also expect RTNL, leading to possible deadlocks or PM lock vs MDIO wake issues. To avoid this, keep the device runtime-PM active by taking a usage reference in ax88772_bind() and dropping it in unbind(). A non-zero PM usage count blocks runtime suspend regardless of userspace policy (.../power/control - pm_runtime_allow/forbid), making this approach robust against sysfs overrides. Holding a runtime-PM usage ref does not affect system-wide suspend; system sleep/resume callbacks continue to run as before.

Affected

26 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.158-1 (bookworm)linux 6.1.158-1 (bookworm)
debianlinux-6.1< linux 6.1.158-1 (bookworm)linux 6.1.158-1 (bookworm)
linuxlinux
linuxlinux>= 4a2c7217cd5a87e85ceb761e307b030fe6db4805 < 71a0ba7fdaf8d035426912a4ed7bf1738a81010c71a0ba7fdaf8d035426912a4ed7bf1738a81010c
linuxlinux>= 4a2c7217cd5a87e85ceb761e307b030fe6db4805 < 3e96cd27ff1a004d84908c1b6cc68ac60913874e3e96cd27ff1a004d84908c1b6cc68ac60913874e
linuxlinux>= 4a2c7217cd5a87e85ceb761e307b030fe6db4805 < 724a9db84188f80ef60b1f21cc7b4e9c84e0cb64724a9db84188f80ef60b1f21cc7b4e9c84e0cb64
linuxlinux>= 4a2c7217cd5a87e85ceb761e307b030fe6db4805 < 1534517300e12f2930b6ff477b8820ff658afd111534517300e12f2930b6ff477b8820ff658afd11
linuxlinux>= 4a2c7217cd5a87e85ceb761e307b030fe6db4805 < 9d8bcaf6fae1bd82bc27ec09a2694497e6f6c4b49d8bcaf6fae1bd82bc27ec09a2694497e6f6c4b4
linuxlinux>= 4a2c7217cd5a87e85ceb761e307b030fe6db4805 < 3d3c4cd5c62f24bb3cb4511b7a95df707635e00a3d3c4cd5c62f24bb3cb4511b7a95df707635e00a
linuxlinux_kernel>= 0 < 6.1.158-16.1.158-1
linuxlinux_kernel>= 0 < 6.12.57-16.12.57-1
linuxlinux_kernel>= 0 < 6.17.6-16.17.6-1
linuxlinux_kernel>= 0 < 5.15.0-170.1805.15.0-170.180
linuxlinux_kernel>= 0 < 6.8.0-106.1066.8.0-106.106
linuxlinux_kernel>= 0 < 6.17.0-14.146.17.0-14.14
linuxlinux_kernel>= 5.14.0 < 5.15.1955.15.195
linuxlinux_kernel>= 5.16.0 < 6.1.1566.1.156
linuxlinux_kernel>= 6.13.0 < 6.17.36.17.3
linuxlinux_kernel>= 6.2.0 < 6.6.1126.6.112
linuxlinux_kernel>= 6.7.0 < 6.12.536.12.53
ubuntulinux-aws
ubuntulinux-azure-5.15
ubuntulinux-intel-iotg-5.15
ubuntulinux-oracle
ubuntulinux-xilinx

CVSS provenance

osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_redhat4.7MEDIUM
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