CVE-2026-89441

Summary

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

mmc: via-sdmmc: cancel card-detect work on remove

Disabling the device interrupt and freeing the IRQ prevents new card-detect work from being queued, but carddet_work already queued by the handler can still run after via_sd_remove() returns. via_sdc_card_detect() recovers the host through container_of() and dereferences its MMIO base; once remove() returns the host can be freed, so that work would touch freed memory.

Cancel carddet_work after freeing the IRQ and before cancelling finish_bh_work, which the card-detect handler can also queue. carddet_work can re-enable the interrupt through via_reset_pcictrl(); mask it again afterwards.

This issue was found by an in-house static analysis tool and confirmed by manual code review.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037
• https://git.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276
• https://git.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5

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