CVE-2026-99246
Received Received - Intake

Use-After-Free in Linux Kernel TIPC Module

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: kernel.org

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.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-99246
EUVD
EUVD-2026-115776

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux eb18a510b5cd4daeb9736ad8db57a9fc49db185b
Linux Linux 5.0

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a use-after-free flaw in the Linux kernel's TIPC (Transparent Inter-Process Communication) module. It occurs when the tipc_node_reset_links trace event attempts to access link data without holding the node lock, allowing another CPU to free the link while the trace callback is still using it. This leads to a stale pointer dereference in tipc_link_dump().

Detection Guidance

This vulnerability is specific to the Linux kernel's TIPC (Transparent Inter-Process Communication) module and requires kernel-level tracing to detect. No direct network or system commands are provided in the context to detect this issue. Monitoring for KASAN slab-use-after-free errors in tipc_link_dump() may indicate exploitation.

Impact Analysis

This vulnerability could cause a system crash or kernel panic if exploited, leading to denial of service. It may also allow local attackers to escalate privileges or execute arbitrary code in the kernel context.

Mitigation Strategies

Apply the Linux kernel patch that resolves this issue by taking the node write lock around the trace event. Update to a kernel version containing the fix. If immediate patching is not possible, disable the TIPC module or restrict its use until patched.

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