CVE-2026-98212 mmc: hsq: Fix use-after-free in retry work
A use-after-free in the Linux kernel MMC host queue driver allows local attackers to cause denial of service or potentially execute code during device unbinding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98212?
CVE-2026-98212 is an use after free vulnerability in Linux, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-98212?
How do I fix CVE-2026-98212?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-98212 being exploited?
There is no known exploitation of CVE-2026-98212 in the wild and no public exploit code.
Sources
Also known as AZL-106418, BELL-CVE-2026-98212, DEBIAN-CVE-2026-98212, GHSA-9ffv-qr59-hrp8, UBUNTU-CVE-2026-98212.