CVE-2026-98211 mmc: mmci: Fix use-after-free in busy-timeout work
A use-after-free in the Linux kernel MMC driver allows local attackers to cause a denial of service or potentially execute code via race conditions during device 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-2026-98211?
CVE-2026-98211 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: mmci: Fix use-after-free in busy-timeout work
ux500_busy_complete() can queue ux500_busy_timeout_work for an R1b command, but mmci_remove() never cancels it. The work can subsequently dereference the devm-allocated mmci_host after it has been released.
Mask the controller interrupts and disable the delayed work during removal. This drains any queued instance and stops an IRQ handler that is still in progress from queueing the work again once it has been disabled.
This issue was found by an in-house static analysis tool.
Which versions are affected by CVE-2026-98211?
How do I fix CVE-2026-98211?
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-2026-98211 being exploited?
There is no known exploitation of CVE-2026-98211 in the wild and no public exploit code.
Sources
Also known as AZL-106191, BELL-CVE-2026-98211, DEBIAN-CVE-2026-98211, GHSA-gv7m-9qc8-g4p7, UBUNTU-CVE-2026-98211.