CVE-2026-98098 (GCVE-0-2026-98098)
Vulnerability from cvelistv5
Published
2026-09-25 10:24
Modified
2026-10-19 09:13
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: fix NULL deref in tipc_named_node_up() on empty publication list User-space applications can bind a large number of service addresses to one or more sockets. Each binding of a local-scope service address inserts one entry (publication) into the TIPC name table. If the number of these publications exceeds TIPC_MAX_PUBL (65535), protocol service types (such as node state and link state) are no longer inserted into the name table. This causes two issues: 1. User-space applications subscribing to node or link up/down events stop receiving notifications. 2. A NULL pointer dereference can occur: BUG: kernel NULL pointer dereference, address: 00000000000000d0 ... CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc4-default+ #5 PREEMPT(full) ... RIP: 0010:tipc_named_node_up (./include/linux/skbuff.h:2251 net/tipc/name_distr.c:195 net/tipc/name_distr.c:221) ... Call Trace: <IRQ> tipc_node_write_unlock (net/tipc/node.c:428) tipc_rcv (net/tipc/node.c:934 net/tipc/node.c:2189) tipc_udp_recv (net/tipc/udp_media.c:389) Thread 1 (tipc_net_finalize) | Thread 2 (named_distribute) -----------------------------|----------------------------- | ... | list_for_each_entry(publ, pls, binding_node) { | ... | __skb_queue_tail(list, skb); | ... | } | ... | hdr = buf_msg(skb_peek_tail(list)); ... | tipc_nametbl_publish(); | If 'tipc_nametbl_publish()' (Thread 1) fails because the number of local publications reaches TIPC_MAX_PUBL, list (Thread 2) will be empty. As a result, NULL is passed to 'buf_msg()', leading to a NULL pointer dereference. Fix these issues by allowing protocol service types (node state, link state, and topology server) to be inserted into the name table unconditionally. This ensures that users subscribing to these types always receive notifications. In addition, the maximum number of local user publications is reduced to (TIPC_MAX_PUBL - 1). This ensures that the maximum bulk size calculated in tipc_link_set_queue_limits() remains valid.
References
Impacted products
Vendor Product Version
Linux Linux Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
Version: a5e7ac5ce134d8f72f59631011fafa7bbf7ca174
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/name_table.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/name_table.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.15"
            },
            {
              "lessThan": "3.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix NULL deref in tipc_named_node_up() on empty publication list\n\nUser-space applications can bind a large number of service addresses to\none or more sockets. Each binding of a local-scope service address inserts\none entry (publication) into the TIPC name table. If the number of these\npublications exceeds TIPC_MAX_PUBL (65535), protocol service types\n(such as node state and link state) are no longer inserted into the name\ntable. This causes two issues:\n\n1. User-space applications subscribing to node or link up/down events\n   stop receiving notifications.\n\n2. A NULL pointer dereference can occur:\n\n   BUG: kernel NULL pointer dereference, address: 00000000000000d0\n   ...\n   CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc4-default+ #5 PREEMPT(full)\n   ...\n   RIP: 0010:tipc_named_node_up (./include/linux/skbuff.h:2251 net/tipc/name_distr.c:195 net/tipc/name_distr.c:221)\n   ...\n   Call Trace:\n   \u003cIRQ\u003e\n   tipc_node_write_unlock (net/tipc/node.c:428)\n   tipc_rcv (net/tipc/node.c:934 net/tipc/node.c:2189)\n   tipc_udp_recv (net/tipc/udp_media.c:389)\n\n   Thread 1 (tipc_net_finalize) | Thread 2 (named_distribute)\n   -----------------------------|-----------------------------\n                                | ...\n                                | list_for_each_entry(publ, pls, binding_node) {\n                                | ...\n                                | __skb_queue_tail(list, skb);\n                                | ...\n                                | }\n                                | ...\n                                | hdr = buf_msg(skb_peek_tail(list));\n   ...                          |\n   tipc_nametbl_publish();      |\n\n   If \u0027tipc_nametbl_publish()\u0027 (Thread 1) fails because the number of\n   local publications reaches TIPC_MAX_PUBL, list (Thread 2) will be empty. As a\n   result, NULL is passed to \u0027buf_msg()\u0027, leading to a NULL pointer dereference.\n\nFix these issues by allowing protocol service types (node state, link state,\nand topology server) to be inserted into the name table unconditionally.\nThis ensures that users subscribing to these types always receive\nnotifications. In addition, the maximum number of local user publications is\nreduced to (TIPC_MAX_PUBL - 1). This ensures that the maximum bulk size\ncalculated in tipc_link_set_queue_limits() remains valid."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:13:51.892Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/246a4b4aace490664927042e93400a6f940d197f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6188cf0c989dea60f2efe800eaebb7d0bd16e2b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5344e459996afb45e30fdc407b41e6674793b21"
        },
        {
          "url": "https://git.kernel.org/stable/c/68619f965329d2f7b113a3d5811aa23198f39105"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad805326d874062f8bc72a94884f86046148cde3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0d82f1214f321143c5dbc2e48e4a4e6c4226895"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3b76e9f4f2476f1135b2ba7743a821db4a0df4b"
        }
      ],
      "title": "tipc: fix NULL deref in tipc_named_node_up() on empty publication list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98098",
    "datePublished": "2026-09-25T10:24:28.298Z",
    "dateReserved": "2026-09-25T10:19:56.077Z",
    "dateUpdated": "2026-10-19T09:13:51.892Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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