{
  "cveId": "CVE-2026-80854",
  "url": "https://patchblox.com/security/cve/CVE-2026-80854",
  "summary": "CVE-2026-80854 is fixed in 40 products on 1 platform, first by DEBIAN-CVE-2026-80854, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "usb: gadget: f_tcm: keep port count until LUN teardown completes",
  "description": "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 \u0022free active\u0022 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.",
  "published": "2026-09-04T16:18:14Z",
  "severity": "Moderate",
  "cvss": 6.4,
  "epss": 0.00182,
  "epssPercentile": 0.07817,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80854",
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