Linux vulnerability

What happened

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 versions

Linux: f0bf7f61b8405224bc52fc9a3ccd167a68126e00 through before f7ff3027ef004a331ef911a4886f12bc2e996037 (git); f0bf7f61b8405224bc52fc9a3ccd167a68126e00 through before eaca730c6f5e3609df62a0469fb789235a93d276 (git); f0bf7f61b8405224bc52fc9a3ccd167a68126e00 through before 57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5 (git); 2.6.31 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.