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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98098
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:39 UTC
Updated2026-09-25 11:17:39 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 68619f965329d2f7b113a3d5811aa23198f39105 git Not specified
CNA Linux Linux affected a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 ad805326d874062f8bc72a94884f86046148cde3 git Not specified
CNA Linux Linux affected a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 d0d82f1214f321143c5dbc2e48e4a4e6c4226895 git Not specified
CNA Linux Linux affected a5e7ac5ce134d8f72f59631011fafa7bbf7ca174 b3b76e9f4f2476f1135b2ba7743a821db4a0df4b git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b3b76e9f4f2476f1135b2ba7743a821db4a0df4b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/68619f965329d2f7b113a3d5811aa23198f39105 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad805326d874062f8bc72a94884f86046148cde3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0d82f1214f321143c5dbc2e48e4a4e6c4226895 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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