CVE-2026-68323 (GCVE-0-2026-68323)
Vulnerability from cvelistv5
Published
2026-08-10 12:02
Modified
2026-10-30 12:28
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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->rcast.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->next should be ffff8880298d7ab8, but was ffff88802449ad38. (prev=ffff888027e3ec98) kernel BUG at lib/list_debug.c:62! RIP: __list_del_entry_valid_or_report+0x17a/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's 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef20cd4dd1633987bcf46ac34ace2c8af212361f
Version: ef20cd4dd1633987bcf46ac34ace2c8af212361f
Version: ef20cd4dd1633987bcf46ac34ace2c8af212361f
Version: ef20cd4dd1633987bcf46ac34ace2c8af212361f
Version: ef20cd4dd1633987bcf46ac34ace2c8af212361f
Version: ef20cd4dd1633987bcf46ac34ace2c8af212361f
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The add runs\\nfrom the encap receive softirq (via tipc_udp_rcast_disc()) without\\nrtnl_lock(), so it can race the cleanup delete and corrupt the list:\\n\\n  list_del corruption. prev-\u003enext should be ffff8880298d7ab8,\\n    but was ffff88802449ad38. (prev=ffff888027e3ec98)\\n  kernel BUG at lib/list_debug.c:62!\\n  RIP: __list_del_entry_valid_or_report+0x17a/0x200\\n  Workqueue: events cleanup_bearer\\n  Call Trace:\\n   cleanup_bearer (net/tipc/udp_media.c:811)\\n   process_one_work (kernel/workqueue.c:3302)\\n   worker_thread (kernel/workqueue.c:3466)\\n\\nThe bearer can be enabled from an unprivileged user namespace, as the\\nTIPCv2 generic-netlink ops carry no GENL_ADMIN_PERM.\\n\\nAdd a spinlock to struct udp_bearer and take it around the list_add_rcu()\\nin tipc_udp_rcast_add() and the list_del_rcu() loop in cleanup_bearer() so\\nthe two writers can no longer corrupt the list.\\n\\nReject a duplicate peer under the same lock before allocating, and remove\\ntipc_udp_is_known_peer(). The old lockless pre-check in\\ntipc_udp_rcast_disc() was racy: two softirqs discovering the same peer\\ncould both find it absent and add it twice.\\n\\ncleanup_bearer() runs from a workqueue after tipc_udp_disable() clears the\\nbearer\u0027s up bit, so an encap softirq can still reach tipc_udp_rcast_add()\\nand add a peer after cleanup_bearer() has already emptied the list, leaking\\nthat entry when the bearer is freed. 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Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.