CVE-2026-74725 enic: fix tx_hang_reset use-after-free on device removal
A use-after-free in the enic driver allows attackers to cause denial of service or execute code during device 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-2026-74725?
CVE-2026-74725 is a high-severity use after free vulnerability in Linux, published on 22 Aug 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:
enic: fix tx_hang_reset use-after-free on device removal
enic_remove() cancels the reset and change_mtu_work items but does not cancel tx_hang_reset. A TX timeout that fires while the device is being removed can schedule enic_tx_hang_reset() so that it runs after free_netdev(), resulting in a use-after-free.
cancel_work_sync() alone is not sufficient here: the still-live watchdog and notify paths can re-schedule these work items in the window between the cancel and unregister_netdev(). Use disable_work_sync(), which cancels the work and blocks any subsequent schedule_work() from requeuing it, and apply it to the reset and change_mtu_work items as well so the same requeue race is closed for all teardown work.
Which versions are affected by CVE-2026-74725?
How do I fix CVE-2026-74725?
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-2026-74725 being exploited?
There is no known exploitation of CVE-2026-74725 in the wild and no public exploit code.
Sources
Also known as AZL-97305, BELL-CVE-2026-74725, DEBIAN-CVE-2026-74725, GHSA-r6pf-7wx9-37hw, UBUNTU-CVE-2026-74725.