CVE-2021-47416

phy: mdio: fix memory leak

MEDIUM

5.5

CVSS Score

Published: May 21, 2024 at 03:04 PM UTC

Updated: June 17, 2026 at 04:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.28 ≤ v < 4.14.2512.6.28 ≤ v < 4.19.2112.6.28 ≤ v < 4.4.2892.6.28 ≤ v < 4.9.2872.6.28 ≤ v < 5.10.732.6.28 ≤ v < 5.14.122.6.28 ≤ v < 5.152.6.28 ≤ v < 5.4.1534.10 ≤ v < 4.14.2514.15 ≤ v < 4.19.2114.20 ≤ v < 5.4.1534.5 ≤ v < 4.9.2875.11 ≤ v < 5.14.125.5 ≤ v < 5.10.7346abc02175b3c246dd5141d878f565a8725060c95.15 rc1 5.15 rc2 5.15 rc3 5.15 rc4

Vendor states this is fixed in 064c2616234a7394867c924b5c1303974f3a4f4d (fixed)

Vendor states this is fixed in 0d2dd40a7be61b89a7c99dae8ee96389d27b413a (fixed)

Vendor states this is fixed in 2250392d930bd0d989f24d355d6355b0150256e7 (fixed)

Vendor states this is fixed in 2397b9e118721292429fea8807a698e71b94795f (fixed)

Vendor states this is fixed in 25e9f88c7e3cc35f5e3d3db199660d28a15df639 (fixed)

Vendor states this is fixed in 414bb4ead1362ef2c8592db723c017258f213988 (fixed)

Vendor states this is fixed in ca6e11c337daf7925ff8a2aac8e84490a8691905 (fixed)

Vendor states this is fixed in f4f502a04ee1e543825af78f47eb7785015cd9f6 (fixed)

Vendor states this is fixed in 2.6.28 (unaffected)

Vendor states this is fixed in 4.14.251 (unaffected)

Vendor states this is fixed in 4.19.211 (unaffected)

Vendor states this is fixed in 4.4.289 (unaffected)