{"id":"CVE-2023-53517","revision":null,"records":[{"revision":"172cec2cac534b9f96343f47f3c4d3fa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-53517","aliases":[],"title":"tipc: do not update mtu if msg_max is too small in mtu negotiation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: do not update mtu if msg_max is too small in mtu negotiation\n\nWhen doing link mtu negotiation, a malicious peer may send Activate msg\nwith a very small mtu, e.g. 4 in Shuang's testing, without checking for\nthe minimum mtu, l->mtu will be set to 4 in tipc_link_proto_rcv(), then\nn->links[bearer_id].mtu is set to 4294967228, which is a overflow of\n'4 - INT_H_SIZE - EMSG_OVERHEAD' in tipc_link_mss().\n\nWith tipc_link.mtu = 4, tipc_link_xmit() kept printing the warning:\n\n tipc: Too large msg, purging xmit list 1 5 0 40 4!\n tipc: Too large msg, purging xmit list 1 15 0 60 4!\n\nAnd with tipc_link_entry.mtu 4294967228, a huge skb was allocated in\nnamed_distribute(), and when purging it in tipc_link_xmit(), a crash\nwas even caused:\n\n general protection fault, probably for non-canonical address 0x2100001011000dd: 0000 [#1] PREEMPT SMP PTI\n CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted 6.3.0.neta #19\n RIP: 0010:kfree_skb_list_reason+0x7e/0x1f0\n Call Trace:\n \n skb_release_data+0xf9/0x1d0\n kfree_skb_reason+0x40/0x100\n tipc_link_xmit+0x57a/0x740 [tipc]\n tipc_node_xmit+0x16c/0x5c0 [tipc]\n tipc_named_node_up+0x27f/0x2c0 [tipc]\n tipc_node_write_unlock+0x149/0x170 [tipc]\n tipc_rcv+0x608/0x740 [tipc]\n tipc_udp_recv+0xdc/0x1f0 [tipc]\n udp_queue_rcv_one_skb+0x33e/0x620\n udp_unicast_rcv_skb.isra.72+0x75/0x90\n __udp4_lib_rcv+0x56d/0xc20\n ip_protocol_deliver_rcu+0x100/0x2d0\n\nThis patch fixes it by checking the new mtu against tipc_bearer_min_mtu(),\nand not updating mtu if it is too small.","state":0,"publishedAt":"2025-10-01T11:46:04.673+00:00","modifiedAt":"2026-10-15T21:41:29.651+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/tipc/link.c\"\n ],\n \"versions\": [\n {\n \"version\": \"ed193ece2649c194a87a9d8470195760d367c075\",\n \"lessThan\": \"2bd4ff4ffb92113f8acd04dbaed83269172c24b4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed193ece2649c194a87a9d8470195760d367c075\",\n \"lessThan\": \"575e84d90a74c0b091b3417ba763ebb237aa0a8c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed193ece2649c194a87a9d8470195760d367c075\",\n \"lessThan\": \"259683001d7e879fea4b42084fb6560dd9408a7e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed193ece2649c194a87a9d8470195760d367c075\",\n \"lessThan\": \"1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ed193ece2649c194a87a9d8470195760d367c075\",\n \"lessThan\": \"56077b56cd3fb78e1c8619e29581ba25a5c55e86\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/tipc/link.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.181\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.113\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.30\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.3.4\",\n \"lessThanOrEqual\": \"6.3.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.4\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/2bd4ff4ffb92113f8acd04dbaed83269172c24b4","https://git.kernel.org/stable/c/575e84d90a74c0b091b3417ba763ebb237aa0a8c","https://git.kernel.org/stable/c/259683001d7e879fea4b42084fb6560dd9408a7e","https://git.kernel.org/stable/c/1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2","https://git.kernel.org/stable/c/56077b56cd3fb78e1c8619e29581ba25a5c55e86"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53517","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-53517","identifiers":["CVE-2023-53517"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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