{
  "cveId": "CVE-2026-98773",
  "url": "https://patchblox.com/security/cve/CVE-2026-98773",
  "summary": "CVE-2026-98773 is fixed in 49 products on 1 platform, first by DEBIAN-CVE-2026-98773, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "USB: cdc-acm: skip URB restart in port_shutdown if disconnected",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  USB: cdc-acm: skip URB restart in port_shutdown if disconnected  acm_port_shutdown() is called from the tty-port machinery whenever the last user closes the port.  acm_disconnect() sets acm-\u003Edisconnected and calls tty_port_tty_vhangup(), which eventually triggers port_shutdown(). At that point acm_disconnect() has already called acm_poison_urbs() and is about to free the control and read URBs.  However, acm_port_shutdown() unconditionally calls acm_unpoison_urbs() and, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the ctrlurb and all read URBs.  If the concurrent acm_disconnect() then frees those URBs and their DMA buffers while they are in-flight, the result is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback() accessing the freed DMA memory.  Fix by checking acm-\u003Edisconnected after draining the delayed anchor and returning early: if we are in a disconnect path the URBs must remain poisoned and must not be resubmitted.  The early return is placed after the delayed-anchor drain loop because that loop only cancels write-side accounting (wb-\u003Euse = false and autopm counter) and does not touch the hardware path.",
  "published": "2026-10-18T16:17:31Z",
  "severity": "Moderate",
  "cvss": 5.7,
  "epss": 0.00172,
  "epssPercentile": 0.06671,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98773",
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