CVE-2026-99035

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/9e799f25c420e759641eb25102967ea091fc758f ↗
• https://git.kernel.org/stable/c/f37e0367ad6f2147a0b37564b442b7a25bec0d23 ↗
• https://git.kernel.org/stable/c/46e75703ca3f00fb8c935b3ce35b90836e34e8af ↗
• https://git.kernel.org/stable/c/edef1355224c0799a502a46b71d3649fa0dd218e ↗
• https://git.kernel.org/stable/c/b38af5386a74416e898955443f2e26547b358cb2 ↗