CVE-2024-50269: usb: musb: sunxi: Fix accessing an released usb phy

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-19 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: usb: musb: sunxi: Fix accessing an released usb phy Commit 6ed05c68cbca ("usb: musb: sunxi: Explicitly release USB PHY on exit") will cause that usb phy @glue->xceiv is accessed after released. 1) register platform driver @sunxi_musb_driver // get the usb phy @glue->xceiv sunxi_musb_probe() -> devm_usb_get_phy(). 2) register and unregister platform driver @musb_driver musb_probe() -> sunxi_musb_init() use the phy here //the phy is released here musb_remove() -> sunxi_musb_exit() -> devm_usb_put_phy() 3) register @musb_driver again musb_probe() -> sunxi_musb_init() use the phy here but the phy has been released at 2). ... Fixed by reverting the commit, namely, removing devm_usb_put_phy() from sunxi_musb_exit().

Affected products

Linux kernel: from 4.4.95 before 4.5; from 4.9.59 before 4.10; from 4.13.10 before 4.14; from 4.14 before 4.19.324; from 4.20 before 5.4.286; from 5.5 before 5.10.230 — fixed in 4.10, 4.14, 4.19.324, 4.5, 5.10.230, 5.15.172

How to fix

Upgrade to a fixed version: Linux kernel 4.10, 4.14, 4.19.324, 4.5. Check the vendor advisory for mitigations.

References

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