CVE-2026-89440

/// Technical description

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

mmc: via-sdmmc: stop card-detect handling on probe failure

request_irq() registers the SD card-detect interrupt and the probe enables

it before mmc_add_host() runs. If mmc_add_host() fails, the error path only

unmaps the registers and returns: the interrupt stays registered, so the

handler keeps running against the host once it is freed. via_sdc_isr()

dereferences sdhost and its MMIO base and schedules carddet_work, which

via_sdc_card_detect() also runs against freed memory through its

container_of() dereference.

Add a probe-error path that disables and frees the interrupt and cancels

carddet_work before unmapping. carddet_work can re-enable the device

interrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it

again after cancelling the work.

This issue was found by an in-house static analysis tool and confirmed by

manual code review.

/// 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