CVE-2024-50061

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

i3c: master: cdns: Fix use after free vulnerability in cdns_i3c_master Driver Due to Race Condition

In the cdns_i3c_master_probe function, &master->hj_work is bound with

cdns_i3c_master_hj. And cdns_i3c_master_interrupt can call

cnds_i3c_master_demux_ibis function to start the work.

If we remove the module which will call cdns_i3c_master_remove to

make cleanup, it will free master->base through i3c_master_unregister

while the work mentioned above will be used. The sequence of operations

that may lead to a UAF bug is as follows:

CPU0 CPU1

| cdns_i3c_master_hj

cdns_i3c_master_remove |

i3c_master_unregister(&master->base) |

device_unregister(&master->dev) |

device_release |

//free master->base |

| i3c_master_do_daa(&master->base)

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References