Linux eNIC driver use-after-free on device removal
CVE-2026-74725 Published on August 22, 2026
enic: fix tx_hang_reset use-after-free on device removal
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.
Products Associated with CVE-2026-74725
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Affected Versions
Linux:- Version 937317c7c1097aa878a5000e3aab616eb5c590c0 and below 8619865f34fb3b130b567855382a5c4aadd522b9 is affected.
- Version 937317c7c1097aa878a5000e3aab616eb5c590c0 and below e506e704b74748ffd0e1c92a7453ca2a959f832b is affected.
- Version 937317c7c1097aa878a5000e3aab616eb5c590c0 and below 4f3464fc6c1f26afc504fd525c574f2bc14c9d42 is affected.
- Version 937317c7c1097aa878a5000e3aab616eb5c590c0 and below ec680ea4ba1bca92a767fb7e7869758bfdd886e3 is affected.
- Version 4.4 is affected.
- Before 4.4 is unaffected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.