CVE-2026-99246

HighCVSS 8.1/10Last modified Nov 3, 2026

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.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < c8b72ca0918e95f708f67c8b3e69b05290f2b6d2; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < 6e492cb98ca69cc1145175e23e22e3b84da7f26d; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < 7bb6a35bd6d69019539d8782fb590fd2aa8a3236; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < 6abd93d01b0f495f29201925a5ee8e6a583c4044; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < a6101d62ccfa153db8c218ce59362b8e0316fd4f; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < fa8c78c0e49aa11fae116fd841e41aa8f2d68751; >= eb18a510b5cd4daeb9736ad8db57a9fc49db185b, < dddf197f29ba5e47a476dde82bf542ca2e0d5e5e
LinuxLinux5.0

References

Timeline

Published
Nov 3, 2026
Last modified
Nov 3, 2026
NVD status
Received

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CVE-2026-99246: High severity, CVSS 8.1 | Vulnix