CVE-2026-93117 usb: fix UAF when probe runs concurrent to dyn ID removal
A use-after-free in the Linux kernel USB subsystem allows local attackers to execute code or escalate privileges via concurrent probe and ID removal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93117?
CVE-2026-93117 is an use after free vulnerability in Linux, published on 17 Sep 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: fix UAF when probe runs concurrent to dyn ID removal
Dynamic IDs are only guaranteed to be valid when usb_dynids_lock is held, as remove_id_store can free the node. Thus, make a copy in usb_probe_interface. Clarify the documentation that the id parameter is only valid during the probe.
USB serial has the same pattern, but it does not need fixing as the IDs cannot be removed via sysfs.
Which versions are affected by CVE-2026-93117?
How do I fix CVE-2026-93117?
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-2026-93117 being exploited?
There is no known exploitation of CVE-2026-93117 in the wild and no public exploit code.
Sources
Also known as AZL-102279, BELL-CVE-2026-93117, DEBIAN-CVE-2026-93117, GHSA-3wfq-66x9-qqjc, UBUNTU-CVE-2026-93117.