Answer in brief
CVE-2026-72405 records a Unknown severity vulnerability in net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <cee6688e5731c0591643521716d1a1a5c1a98bf8 || >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7 || >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <54292b167466cdf42176b7b6f01da66c184deb12 || >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <ecf69d4b43370c587e48d4d70289dbdb7e039d4d | cee6688e5731c0591643521716d1a1a5c1a98bf8, 9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7, 54292b167466cdf42176b7b6f01da66c184deb12, ecf69d4b43370c587e48d4d70289dbdb7e039d4d |
| Linux/Linuxgeneric | 5.9 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-72405 records a Unknown severity vulnerability in net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <cee6688e5731c0591643521716d1a1a5c1a98bf8 || >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7 || >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <54292b167466cdf42176b7b6f01da66c184deb12 || >=cc4e3835eff474aa274d6e1d18f69d9d296d3b76 <ecf69d4b43370c587e48d4d70289dbdb7e039d4d | cee6688e5731c0591643521716d1a1a5c1a98bf8, 9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7, 54292b167466cdf42176b7b6f01da66c184deb12, ecf69d4b43370c587e48d4d70289dbdb7e039d4d |
| Linux/Linuxgeneric | 5.9 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.