CVE-2026-98213 mmc: core: Cancel SDIO IRQ work before freeing host
A use-after-free in the Linux kernel MMC core allows local attackers to cause a denial of service or potentially execute code by triggering a race condition during host removal.
- 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-2026-98213?
CVE-2026-98213 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: core: Cancel SDIO IRQ work before freeing host
A host controller that uses sdio_signal_irq() schedules host->sdio_irq_work from its interrupt handler. That work is only cancelled on the suspend path (mmc_sdio_suspend()), not on the remove/free path, so a worker armed just before the controller freed its IRQ can run after mmc_host_classdev_release() has freed the host and dereference it through container_of().
Cancel host->sdio_irq_work in mmc_free_host(), like the existing host->detect drain added by commit 1036f69e2513 ("mmc: core: Cancel delayed work before releasing host").
This issue was found by an in-house static analysis tool.
Which versions are affected by CVE-2026-98213?
How do I fix CVE-2026-98213?
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-2026-98213 being exploited?
There is no known exploitation of CVE-2026-98213 in the wild and no public exploit code.
Sources
Also known as AZL-106110, BELL-CVE-2026-98213, DEBIAN-CVE-2026-98213, GHSA-q4vm-jrgj-pmvw, UBUNTU-CVE-2026-98213.