CVE-2023-53106

/// Technical description

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

nfc: st-nci: Fix use after free bug in ndlc_remove due to race condition

This bug influences both st_nci_i2c_remove and st_nci_spi_remove.

Take st_nci_i2c_remove as an example.

In st_nci_i2c_probe, it called ndlc_probe and bound &ndlc->sm_work

with llt_ndlc_sm_work.

When it calls ndlc_recv or timeout handler, it will finally call

schedule_work to start the work.

When we call st_nci_i2c_remove to remove the driver, there

may be a sequence as follows:

Fix it by finishing the work before cleanup in ndlc_remove

CPU0 CPU1

|llt_ndlc_sm_work

st_nci_i2c_remove |

ndlc_remove |

st_nci_remove |

nci_free_device|

kfree(ndev) |

//free ndlc->ndev |

|llt_ndlc_rcv_queue

|nci_recv_frame

|//use ndlc->ndev

/// 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