Answer in brief
CVE-2026-80854 records a Unknown severity vulnerability in usb: gadget: f_tcm: keep port count until LUN teardown completes. 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 | >=c52661d60f636d17e26ad834457db333bd1df494 <c494c5562ca69b61a82f566e3b87a445d2c28929 || >=c52661d60f636d17e26ad834457db333bd1df494 <c1f359d9a5efed458946063de65ddbeaacc4f165 || >=c52661d60f636d17e26ad834457db333bd1df494 <178f59a0bccd3f66cdfa5184310f31a58b7257c4 || >=c52661d60f636d17e26ad834457db333bd1df494 <ad6f0375d2e93a1d8c015463e5e92dfcb26e311b || >=c52661d60f636d17e26ad834457db333bd1df494 <2efbfd42441d3ef8137aff2d59e9835e1d5ae780 || >=c52661d60f636d17e26ad834457db333bd1df494 <85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95 || >=c52661d60f636d17e26ad834457db333bd1df494 <bbd6aa311a9f4dd17822c7557451458d3d2e980b || >=c52661d60f636d17e26ad834457db333bd1df494 <eaa96a8458f54d6cf0954242ab8b1df2a6fccafa || >=c52661d60f636d17e26ad834457db333bd1df494 <c39d0916da47d94909391876c9e5bd429ea7b1b9 | c494c5562ca69b61a82f566e3b87a445d2c28929, c1f359d9a5efed458946063de65ddbeaacc4f165, 178f59a0bccd3f66cdfa5184310f31a58b7257c4, ad6f0375d2e93a1d8c015463e5e92dfcb26e311b, 2efbfd42441d3ef8137aff2d59e9835e1d5ae780, 85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95, bbd6aa311a9f4dd17822c7557451458d3d2e980b, eaa96a8458f54d6cf0954242ab8b1df2a6fccafa, c39d0916da47d94909391876c9e5bd429ea7b1b9 |
| Linux/Linuxgeneric | 3.5 | Not reported |
Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 4, 2026
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_tcm: keep port count until LUN teardown completes tcm_usbg_drop_nexus() permits session removal once tpg_port_count reaches zero. However, usbg_port_unlink() currently decrements that count from the fabric_pre_unlink() callback, before core_dev_del_lun() waits for active se_lun references to drain. If removal of the last LUN races a nexus removal, the latter can observe a zero port count and call target_remove_session(). This frees sess_cmd_map while an in-flight struct usbg_cmd, including its work item, can still be accessed. Overlapping the last-LUN unlink with nexus removal reproduces this lifetime violation as a DEBUG_OBJECTS "free active" warning for usbg_cmd_work, followed by a target-core BUG/Oops. The generic target-core unlink path has no callback after core_dev_del_lun() completes. Add an optional fabric_post_unlink() callback and use it for the f_tcm port count. The count now remains nonzero until core_dev_del_lun() has finished draining active LUN references, preventing nexus removal from freeing the session during command completion.
Quoted source text, attributed separately from HOL analysis.