CVE-2026-80556

/// Technical description

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

mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition

In atmci_probe, &host->bh_work is bound with atmci_work_func, and

atmci_interrupt, atmci_timeout_timer and atmci_dma_complete can all

queue this work on system_bh_wq.

If we remove the module, atmci_remove makes cleanup and the memory

allocated for host with devm_kzalloc() is released after the remove

callback returns, while the work mentioned above may still be pending

or running. The sequence of operations that may lead to a UAF bug is

as follows:

CPU0 CPU1

| atmci_interrupt

| queue_work(system_bh_wq,

| &host->bh_work)

atmci_remove |

atmci_cleanup_slot(...) |

atmci_writel(host, ATMCI_IDR, ~0UL) |

timer_delete_sync(&hos

/// 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