{
  "cveId": "CVE-2026-89891",
  "url": "https://patchblox.com/security/cve/CVE-2026-89891",
  "summary": "CVE-2026-89891 is fixed in 47 products on 1 platform, first by DEBIAN-CVE-2026-89891, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "media: em28xx: fix use-after-free of dev_next-\u003Edevlist on disconnect",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  media: em28xx: fix use-after-free of dev_next-\u003Edevlist on disconnect  When a device with has_dual_ts=1 is probed and the is_audio_only path is taken, both dev and dev-\u003Edev_next are added to the global em28xx_devlist via em28xx_init_extension(). However, during disconnect, em28xx_close_extension(dev) only calls list_del(\u0026dev-\u003Edevlist), leaving dev-\u003Edev_next-\u003Edevlist still linked in the global list. When dev_next is subsequently freed via kref_put(), its devlist entry becomes a dangling pointer in em28xx_devlist. The next device probe that calls em28xx_init_extension() triggers a list corruption BUG when list_add_tail detects the freed node.  This bug was exposed by commit a368ecde8a50 (\u0022USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor\u0022) which clears reserved bits in bEndpointAddress during endpoint parsing. This causes fuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which em28xx interprets as a vendor audio endpoint, enabling the is_audio_only \u002B has_dual_ts code path that was previously unreachable with such descriptors.  Fix this by removing dev-\u003Edev_next-\u003Edevlist from the global list in em28xx_close_extension() before the device is freed.",
  "published": "2026-09-16T11:16:57Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "epss": 0.00216,
  "epssPercentile": 0.12171,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89891",
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