CVE-2023-53517 (GCVE-0-2023-53517)
Vulnerability from cvelistv5
Published
2025-10-01 11:46
Modified
2025-10-01 11:46
Severity ?
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: ed193ece2649c194a87a9d8470195760d367c075
Version: ed193ece2649c194a87a9d8470195760d367c075
Version: ed193ece2649c194a87a9d8470195760d367c075
Version: ed193ece2649c194a87a9d8470195760d367c075
Version: ed193ece2649c194a87a9d8470195760d367c075
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/link.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/link.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.1"
            },
            {
              "lessThan": "4.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.181",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.113",
                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.30",
                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.4",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4",
                  "versionStartIncluding": "4.1",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s testing, without checking for\nthe minimum mtu, l-\u003emtu will be set to 4 in tipc_link_proto_rcv(), then\nn-\u003elinks[bearer_id].mtu is set to 4294967228, which is a overflow of\n\u00274 - INT_H_SIZE - EMSG_OVERHEAD\u0027 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   \u003cIRQ\u003e\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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:46:04.673Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2bd4ff4ffb92113f8acd04dbaed83269172c24b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/575e84d90a74c0b091b3417ba763ebb237aa0a8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/259683001d7e879fea4b42084fb6560dd9408a7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/56077b56cd3fb78e1c8619e29581ba25a5c55e86"
        }
      ],
      "title": "tipc: do not update mtu if msg_max is too small in mtu negotiation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53517",
    "datePublished": "2025-10-01T11:46:04.673Z",
    "dateReserved": "2025-10-01T11:39:39.406Z",
    "dateUpdated": "2025-10-01T11:46:04.673Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53517\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:55.873\",\"lastModified\":\"2025-10-02T19:11:46.753\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027s testing, without checking for\\nthe minimum mtu, l-\u003emtu will be set to 4 in tipc_link_proto_rcv(), then\\nn-\u003elinks[bearer_id].mtu is set to 4294967228, which is a overflow of\\n\u00274 - INT_H_SIZE - EMSG_OVERHEAD\u0027 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   \u003cIRQ\u003e\\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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1dd7ae5e0cf5a56e513f7ab7ab9570b7496281d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/259683001d7e879fea4b42084fb6560dd9408a7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2bd4ff4ffb92113f8acd04dbaed83269172c24b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56077b56cd3fb78e1c8619e29581ba25a5c55e86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/575e84d90a74c0b091b3417ba763ebb237aa0a8c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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