Live › vulnerability › CVE-2026-99035
Go to dashboardIn the Linux kernel's MediaTek mtk-sd MMC driver, a pending request timeout callback can run after the driver is removed, touching freed host memory. The description reports KASAN use-after-free reports during unbind tests, so the likely effect is a kernel crash or memory corruption on unbind.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Only systems running a Linux kernel with the MediaTek mtk-sd MMC host driver, typically MediaTek-based boards and devices, where the driver can be unbound. The sources do not describe a remote trigger, so ordinary servers without this hardware are unlikely to be exposed. Systems that never unbind this driver are unlikely to hit the race.
No product ranges from the sources yet.
lsmod | grep mtk_sd or by looking for an mtk-sd device bound under /sys/bus/platform/drivers/.uname -r.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
mmc: mtk-sd: Cancel request timeout work on remove
The driver queues req_timeout while a request is active. msdc_request_done() uses cancel_delayed_work(), which does not wait for a timeout callback that has already started.
The timeout callback calls mmc_request_done(), which wakes the request waiter, and then continues to use host->dev_comp and check the SDIO IRQ. During unbind, msdc_drv_remove() can return and the managed mmc_host can be freed before the callback finishes.
KASAN reported use-after-free accesses in msdc_request_done() and msdc_recheck_sdio_irq() in each of three unbind tests. The same tests completed without a kernel diagnostic after this change.
Call cancel_delayed_work_sync() after mmc_remove_host() has stopped new requests and before the driver releases the host resources.
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