CVE-2026-98758 usb: typec: ucsi: glink: fix use-after-free of ucsi on remove
A use-after-free vulnerability in the Linux kernel's UCSI GLINK driver allows local attackers to execute arbitrary code or cause a denial of service.
- 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-2026-98758?
CVE-2026-98758 is an use after free vulnerability in Linux, published on 18 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:
usb: typec: ucsi: glink: fix use-after-free of ucsi on remove
The pmic_glink client is released by the devres cleanup, which runs after pmic_glink_ucsi_remove() has returned, so its notification callbacks can queue work until then. Work that runs after ucsi_unregister() has been called touches freed state: it dereferences the connector array that ucsi_unregister() freed, or registers and unregisters the instance a second time.
Disable both work items with disable_work_sync() before unregistering, and unregister only if the instance is still registered.
This issue was found by an in-house static analysis tool.
Which versions are affected by CVE-2026-98758?
How do I fix CVE-2026-98758?
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-2026-98758 being exploited?
There is no known exploitation of CVE-2026-98758 in the wild and no public exploit code.
Sources
Also known as AZL-108614, BELL-CVE-2026-98758, DEBIAN-CVE-2026-98758, GHSA-hvv7-vw9m-6v98, UBUNTU-CVE-2026-98758.