CVE-2026-99246High· 8.1▾ Twilight

tipc: protect node reset trace dump with node lock

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 e…

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score45/ 100 · Moderate

impact 44.6 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Nov 3, 2026

Updated

Nov 3, 2026

CVSS

8.1

Vendor

Linux

Product

Linux

CWE

—

Depth score

45 · Moderate

EPSS

0.44% · p39

Platforms

—

Source

CVEORG

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

2 events · 2 days

Nov 3, 2026Published
Disclosed via CVEORG
Nov 5, 2026EPSS first tracked
0.4%

Linux #cve.org

Affected

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < c8b72ca0918e95f708f67c8b3e69b05290f2b6d2
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 6e492cb98ca69cc1145175e23e22e3b84da7f26d
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 7bb6a35bd6d69019539d8782fb590fd2aa8a3236
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 6abd93d01b0f495f29201925a5ee8e6a583c4044
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < a6101d62ccfa153db8c218ce59362b8e0316fd4f
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < fa8c78c0e49aa11fae116fd841e41aa8f2d68751
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < dddf197f29ba5e47a476dde82bf542ca2e0d5e5e
Linux 5.0

Full technical detail▾

Overview

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.

Affected

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < c8b72ca0918e95f708f67c8b3e69b05290f2b6d2
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 6e492cb98ca69cc1145175e23e22e3b84da7f26d
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 7bb6a35bd6d69019539d8782fb590fd2aa8a3236
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 6abd93d01b0f495f29201925a5ee8e6a583c4044
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < a6101d62ccfa153db8c218ce59362b8e0316fd4f
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < fa8c78c0e49aa11fae116fd841e41aa8f2d68751
Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < dddf197f29ba5e47a476dde82bf542ca2e0d5e5e
Linux 5.0

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org

tipc: protect node reset trace dump with node lock

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score45/ 100 · Moderate

impact 44.6 · likelihood 0.1 · exploitation 0

Overview

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:

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.

Affected

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < c8b72ca0918e95f708f67c8b3e69b05290f2b6d2

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 6e492cb98ca69cc1145175e23e22e3b84da7f26d

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 7bb6a35bd6d69019539d8782fb590fd2aa8a3236

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < 6abd93d01b0f495f29201925a5ee8e6a583c4044

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < a6101d62ccfa153db8c218ce59362b8e0316fd4f

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < fa8c78c0e49aa11fae116fd841e41aa8f2d68751

Linux >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b < dddf197f29ba5e47a476dde82bf542ca2e0d5e5e

Linux 5.0