CVE-2026-72405
Description
In the Linux kernel, the following vulnerability has been resolved: net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync Yue Sun reported a use-after-free and debugobjects warning in udp_tunnel_nic_device_sync_work() during concurrent device operations. The workqueue core clears the internal pending bit before invoking the worker. At that point, a concurrent thread can queue the work again. When the already running worker eventually clears the work_pending flag to 0, it mistakenly clears the flag for the newly queued instance. udp_tunnel_nic_unregister() then observes work_pending as 0 and frees the structure while the second work item is still active in the queue, leading to UAF. Fix this by returning early in udp_tunnel_nic_device_sync() if work_pending is already set, preventing redundant work queueing.
How to fix
- Linux Linuxd59d3b19e1cd1a01a6db59705327387a30aed153, f49ed02fd8c98da823fdd7b00d64a8cc1d1883ac, cee6688e5731c0591643521716d1a1a5c1a98bf8, 9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7, 54292b167466cdf42176b7b6f01da66c184deb12, ecf69d4b43370c587e48d4d70289dbdb7e039d4d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | cc4e3835eff474aa274d6e1d18f69d9d296d3b76 ≤ v < d59d3b19e1cd1a01a6db59705327387a30aed153, cc4e3835eff474aa274d6e1d18f69d9d296d3b76 ≤ v < f49ed02fd8c98da823fdd7b00d64a8cc1d1883ac, cc4e3835eff474aa274d6e1d18f69d9d296d3b76 ≤ v < cee6688e5731c0591643521716d1a1a5c1a98bf8, cc4e3835eff474aa274d6e1d18f69d9d296d3b76 ≤ v < 9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7, cc4e3835eff474aa274d6e1d18f69d9d296d3b76 ≤ v < 54292b167466cdf42176b7b6f01da66c184deb12, cc4e3835eff474aa274d6e1d18f69d9d296d3b76 ≤ v < ecf69d4b43370c587e48d4d70289dbdb7e039d4d, 5.9 | d59d3b19e1cd1a01a6db59705327387a30aed153, f49ed02fd8c98da823fdd7b00d64a8cc1d1883ac, cee6688e5731c0591643521716d1a1a5c1a98bf8, 9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7, 54292b167466cdf42176b7b6f01da66c184deb12, ecf69d4b43370c587e48d4d70289dbdb7e039d4d |
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