CVE-2021-47416
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.
Does this matter?
Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.23% probability · 14th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-401
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4dPatch
- https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413aPatch
- https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7Patch
- https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795fPatch
- https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639Patch
- https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988Patch
- https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905Patch
- https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6Patch
- https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4dPatch
- https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413aPatch
- https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7Patch
- https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795fPatch
- https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639Patch
- https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988Patch
- https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905Patch
- https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.