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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98098

tipc: fix NULL deref in tipc_named_node_up() on empty publication list

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix NULL deref in tipc_named_node_up() on empty publication list User-space applications can bind a large number of service addresses to one or more sockets. Each binding of a local-scope service address inserts one entry (publication) into the TIPC name table. If the number of these publications exceeds TIPC_MAX_PUBL (65535), protocol service types (such as node state and link state) are no longer inserted into the name table. This causes two issues: 1. User-space applications subscribing to node or link up/down events stop receiving notifications. 2. A NULL pointer dereference can occur: BUG: kernel NULL pointer dereference, address: 00000000000000d0 ... CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc4-default+ #5 PREEMPT(full) ... RIP: 0010:tipc_named_node_up (./include/linux/skbuff.h:2251 net/tipc/name_distr.c:195 net/tipc/name_distr.c:221) ... Call Trace: <IRQ> tipc_node_write_unlock (net/tipc/node.c:428) tipc_rcv (net/tipc/node.c:934 net/tipc/node.c:2189) tipc_udp_recv (net/tipc/udp_media.c:389) Thread 1 (tipc_net_finalize) | Thread 2 (named_distribute) -----------------------------|----------------------------- | ... | list_for_each_entry(publ, pls, binding_node) { | ... | __skb_queue_tail(list, skb); | ... | } | ... | hdr = buf_msg(skb_peek_tail(list)); ... | tipc_nametbl_publish(); | If 'tipc_nametbl_publish()' (Thread 1) fails because the number of local publications reaches TIPC_MAX_PUBL, list (Thread 2) will be empty. As a result, NULL is passed to 'buf_msg()', leading to a NULL pointer dereference. Fix these issues by allowing protocol service types (node state, link state, and topology server) to be inserted into the name table unconditionally. This ensures that users subscribing to these types always receive notifications. In addition, the maximum number of local user publications is reduced to (TIPC_MAX_PUBL - 1). This ensures that the maximum bulk size calculated in tipc_link_set_queue_limits() remains valid.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < 246a4b4aace490664927042e93400a6f940d197faffected
  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < 6188cf0c989dea60f2efe800eaebb7d0bd16e2b2affected
  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < b5344e459996afb45e30fdc407b41e6674793b21affected
  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < 68619f965329d2f7b113a3d5811aa23198f39105affected
  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < ad805326d874062f8bc72a94884f86046148cde3affected
  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < d0d82f1214f321143c5dbc2e48e4a4e6c4226895affected
  • a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 to < b3b76e9f4f2476f1135b2ba7743a821db4a0df4baffected

Linux Linux

Default version status: affected

  • 3.15affected
  • 0 to < 3.15unaffected
  • 5.15.222 to ≤ 5.15.*unaffected
  • 6.1.189 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.2.7 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References