CVE-2026-80556
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, the mmc: atmel-mci driver has a use-after-free (UAF) vulnerability in atmci_remove due to a race condition. The host->bh_work can be queued by interrupt, timer, or DMA completion, and after module removal the host memory is freed before the work finishes, leading to use of freed memory.
Risk Assessment
An attacker with access to the MMC interface (e.g., via removable memory card) could cause kernel memory corruption, potentially leading to privilege escalation, information leak, or system crash (kernel panic).
Recommendation
Apply the official Linux kernel patch that cancels the work after stopping all sources that can schedule it (IRQ, timer, DMA) before freeing resources. Update the system to a kernel version containing the fix.
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Original NVD description (English source)
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(&host->timer) | dma_release_channel(host->dma.chan) | free_irq(platform_get_irq(pdev, 0), host) | | atmci_work_func | // use host // devm resources released after | // remove returns, host is freed | | // use host (use-after-free) Fix it by canceling the work after all the sources that can schedule it (IRQ handler, timeout timer and DMA completion callback) have been stopped, and before proceeding with the remaining cleanup in atmci_remove.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS