Description
In the Linux kernel, the following vulnerability has been resolved:
tipc: protect node reset trace dump with node lock
The tipc_node_reset_links trace event asks tipc_node_dump() to walk the
node's link entries. Unlike the other node events that request link data,
this event runs without the node lock.
This permits bearer teardown to free a link while the trace callback is
dumping it:
CPU 0 CPU 1
trace_tipc_node_reset_links()
tipc_node_dump()
l = n->links[0].link
tipc_node_write_lock()
kfree(l)
n->links[0].link = NULL
tipc_node_write_unlock()
tipc_link_dump(l)
tipc_link_dump() then dereferences the stale pointer. KASAN reported:
BUG: KASAN: slab-use-after-free in tipc_link_dump
Read of size 4 by task poc/115
Call Trace:
tipc_link_dump+0x10cb/0x16b0
tipc_node_dump+0x4bb/0x740
trace_event_raw_event_tipc_node_class+0x258/0x360
tipc_node_reset_links+0x14d/0x1a0
tipc_rcv+0x13f5/0x3030
tipc_udp_recv+0x4e3/0x670
Allocated by task 0:
tipc_link_create+0x1e1/0x1020
tipc_node_check_dest+0x7d2/0x11a0
tipc_disc_rcv+0xdbf/0x1430
Freed by task 89:
kfree+0x131/0x3c0
tipc_node_link_down+0x267/0x4b0
tipc_node_delete_links+0xec/0x160
bearer_disable+0x107/0x260
Take the node write lock around the trace event. This serializes the
dump against tipc_node_link_down(delete=true), which frees the link
under the same write lock.
tipc: protect node reset trace dump with node lock
The tipc_node_reset_links trace event asks tipc_node_dump() to walk the
node's link entries. Unlike the other node events that request link data,
this event runs without the node lock.
This permits bearer teardown to free a link while the trace callback is
dumping it:
CPU 0 CPU 1
trace_tipc_node_reset_links()
tipc_node_dump()
l = n->links[0].link
tipc_node_write_lock()
kfree(l)
n->links[0].link = NULL
tipc_node_write_unlock()
tipc_link_dump(l)
tipc_link_dump() then dereferences the stale pointer. KASAN reported:
BUG: KASAN: slab-use-after-free in tipc_link_dump
Read of size 4 by task poc/115
Call Trace:
tipc_link_dump+0x10cb/0x16b0
tipc_node_dump+0x4bb/0x740
trace_event_raw_event_tipc_node_class+0x258/0x360
tipc_node_reset_links+0x14d/0x1a0
tipc_rcv+0x13f5/0x3030
tipc_udp_recv+0x4e3/0x670
Allocated by task 0:
tipc_link_create+0x1e1/0x1020
tipc_node_check_dest+0x7d2/0x11a0
tipc_disc_rcv+0xdbf/0x1430
Freed by task 89:
kfree+0x131/0x3c0
tipc_node_link_down+0x267/0x4b0
tipc_node_delete_links+0xec/0x160
bearer_disable+0x107/0x260
Take the node write lock around the trace event. This serializes the
dump against tipc_node_link_down(delete=true), which frees the link
under the same write lock.
Published:
2026-11-03
Score:
n/a
EPSS:
n/a
KEV:
No
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
|
|||||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
No data.
No data.
No data available yet.
Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
Sign in to view the affected projects.
Advisories
No advisories yet.
References
History
Tue, 03 Nov 2026 11:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: tipc: protect node reset trace dump with node lock The tipc_node_reset_links trace event asks tipc_node_dump() to walk the node's link entries. Unlike the other node events that request link data, this event runs without the node lock. This permits bearer teardown to free a link while the trace callback is dumping it: CPU 0 CPU 1 trace_tipc_node_reset_links() tipc_node_dump() l = n->links[0].link tipc_node_write_lock() kfree(l) n->links[0].link = NULL tipc_node_write_unlock() tipc_link_dump(l) tipc_link_dump() then dereferences the stale pointer. KASAN reported: BUG: KASAN: slab-use-after-free in tipc_link_dump Read of size 4 by task poc/115 Call Trace: tipc_link_dump+0x10cb/0x16b0 tipc_node_dump+0x4bb/0x740 trace_event_raw_event_tipc_node_class+0x258/0x360 tipc_node_reset_links+0x14d/0x1a0 tipc_rcv+0x13f5/0x3030 tipc_udp_recv+0x4e3/0x670 Allocated by task 0: tipc_link_create+0x1e1/0x1020 tipc_node_check_dest+0x7d2/0x11a0 tipc_disc_rcv+0xdbf/0x1430 Freed by task 89: kfree+0x131/0x3c0 tipc_node_link_down+0x267/0x4b0 tipc_node_delete_links+0xec/0x160 bearer_disable+0x107/0x260 Take the node write lock around the trace event. This serializes the dump against tipc_node_link_down(delete=true), which frees the link under the same write lock. | |
| Title | tipc: protect node reset trace dump with node lock | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-11-03T11:18:25.838Z
Reserved: 2026-09-25T10:25:14.403Z
Link: CVE-2026-99246
Vulnrichment
No data.
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.