In the Linux kernel, the following vulnerability has been resolved:
tipc: do not update mtu if msg_max is too small in mtu negotiation
When doing link mtu negotiation, a malicious peer may send Activate msg
with a very small mtu, e.g. 4 in Shuang's testing, without checking for
the minimum mtu, l->mtu will be set to 4 in tipc_link_proto_rcv(), then
n->links[bearer_id].mtu is set to 4294967228, which is a overflow of
'4 - INT_H_SIZE - EMSG_OVERHEAD' in tipc_link_mss().
With tipc_link.mtu = 4, tipc_link_xmit() kept printing the warning:
tipc: Too large msg, purging xmit list 1 5 0 40 4!
tipc: Too large msg, purging xmit list 1 15 0 60 4!
And with tipc_link_entry.mtu 4294967228, a huge skb was allocated in
named_distribute(), and when purging it in tipc_link_xmit(), a crash
was even caused:
general protection fault, probably for non-canonical address 0x2100001011000dd: 0000 [#1] PREEMPT SMP PTI
CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted 6.3.0.neta #19
RIP: 0010:kfree_skb_list_reason+0x7e/0x1f0
Call Trace:
<IRQ>
skb_release_data+0xf9/0x1d0
kfree_skb_reason+0x40/0x100
tipc_link_xmit+0x57a/0x740 [tipc]
tipc_node_xmit+0x16c/0x5c0 [tipc]
tipc_named_node_up+0x27f/0x2c0 [tipc]
tipc_node_write_unlock+0x149/0x170 [tipc]
tipc_rcv+0x608/0x740 [tipc]
tipc_udp_recv+0xdc/0x1f0 [tipc]
udp_queue_rcv_one_skb+0x33e/0x620
udp_unicast_rcv_skb.isra.72+0x75/0x90
__udp4_lib_rcv+0x56d/0xc20
ip_protocol_deliver_rcu+0x100/0x2d0
This patch fixes it by checking the new mtu against tipc_bearer_min_mtu(),
and not updating mtu if it is too small.
References
Configurations
Configuration 1 (hide)
|
History
26 Jan 2026, 20:09
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2 - Patch | |
| References | () https://git.kernel.org/stable/c/259683001d7e879fea4b42084fb6560dd9408a7e - Patch | |
| References | () https://git.kernel.org/stable/c/2bd4ff4ffb92113f8acd04dbaed83269172c24b4 - Patch | |
| References | () https://git.kernel.org/stable/c/56077b56cd3fb78e1c8619e29581ba25a5c55e86 - Patch | |
| References | () https://git.kernel.org/stable/c/575e84d90a74c0b091b3417ba763ebb237aa0a8c - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:6.4:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.4:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| First Time |
Linux
Linux linux Kernel |
|
| CWE | NVD-CWE-noinfo | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
01 Oct 2025, 12:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-01 12:15
Updated : 2026-01-26 20:09
NVD link : CVE-2023-53517
Mitre link : CVE-2023-53517
CVE.ORG link : CVE-2023-53517
JSON object : View
Products Affected
linux
- linux_kernel
CWE