{
  "cveId": "CVE-2026-68323",
  "url": "https://patchblox.com/security/cve/CVE-2026-68323",
  "summary": "CVE-2026-68323 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-68323, released August 11, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "tipc: serialize udp bearer replicast list updates",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tipc: serialize udp bearer replicast list updates  tipc_udp_rcast_add() and cleanup_bearer() both update ub-\u003Ercast.list with list_add_rcu() / list_del_rcu(), but nothing serializes them. The add runs from the encap receive softirq (via tipc_udp_rcast_disc()) without rtnl_lock(), so it can race the cleanup delete and corrupt the list:    list_del corruption. prev-\u003Enext should be ffff8880298d7ab8,     but was ffff88802449ad38. (prev=ffff888027e3ec98)   kernel BUG at lib/list_debug.c:62!   RIP: __list_del_entry_valid_or_report\u002B0x17a/0x200   Workqueue: events cleanup_bearer   Call Trace:    cleanup_bearer (net/tipc/udp_media.c:811)    process_one_work (kernel/workqueue.c:3302)    worker_thread (kernel/workqueue.c:3466)  The bearer can be enabled from an unprivileged user namespace, as the TIPCv2 generic-netlink ops carry no GENL_ADMIN_PERM.  Add a spinlock to struct udp_bearer and take it around the list_add_rcu() in tipc_udp_rcast_add() and the list_del_rcu() loop in cleanup_bearer() so the two writers can no longer corrupt the list.  Reject a duplicate peer under the same lock before allocating, and remove tipc_udp_is_known_peer(). The old lockless pre-check in tipc_udp_rcast_disc() was racy: two softirqs discovering the same peer could both find it absent and add it twice.  cleanup_bearer() runs from a workqueue after tipc_udp_disable() clears the bearer\u0027s up bit, so an encap softirq can still reach tipc_udp_rcast_add() and add a peer after cleanup_bearer() has already emptied the list, leaking that entry when the bearer is freed. Mark the bearer disabled under rcast_lock once the list is emptied and refuse further additions.",
  "published": "2026-08-10T13:20:22Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.001,
  "epssPercentile": 0.00857,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68323",
  "fixes": [
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      "fix": "OPENSUSE-SU-2026:22167-1",
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      "released": "2026-11-07T00:47:19Z"
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      "fix": "OPENSUSE-SU-2026:22167-1",
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      "fix": "SUSE-SU-2026:4935-1",
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      "released": "2026-11-07T00:43:02Z"
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}