CVE-2026-89440

Published: September 15, 2026Last modified: September 15, 2026

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.

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References

• https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d
• https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b
• https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4
• https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99