CVE-2026-23255 (GCVE-0-2026-23255)

Vulnerability from cvelistv5 – Published: 2026-03-18 17:41 – Updated: 2026-11-10 12:42
VLAI
Title
net: add proper RCU protection to /proc/net/ptype
Summary
In the Linux kernel, the following vulnerability has been resolved: net: add proper RCU protection to /proc/net/ptype Yin Fengwei reported an RCU stall in ptype_seq_show() and provided a patch. Real issue is that ptype_seq_next() and ptype_seq_show() violate RCU rules. ptype_seq_show() runs under rcu_read_lock(), and reads pt->dev to get device name without any barrier. At the same time, concurrent writers can remove a packet_type structure (which is correctly freed after an RCU grace period) and clear pt->dev without an RCU grace period. Define ptype_iter_state to carry a dev pointer along seq_net_private: struct ptype_iter_state { struct seq_net_private p; struct net_device *dev; // added in this patch }; We need to record the device pointer in ptype_get_idx() and ptype_seq_next() so that ptype_seq_show() is safe against concurrent pt->dev changes. We also need to add full RCU protection in ptype_seq_next(). (Missing READ_ONCE() when reading list.next values) Many thanks to Dong Chenchen for providing a repro.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 21:23 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e974a10a52618f7f57a4bce173a0ed96acd4e5dc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 002a73470b56848e4c81efeaaedd471e92d66d8d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dcefd3f0b9ed8288654c75254bdcee8e1085e861 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 589a530ae44d0c80f523fcfd1a15af8087f27d35 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f613e8b4afea0cd17c7168e8b00e25bc8d33175d (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.7 , < * (custom)
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: a\u00f1adir protecci\u00f3n RCU adecuada a /proc/net/ptype\n\nYin Fengwei inform\u00f3 de un bloqueo RCU en ptype_seq_show() y proporcion\u00f3 un parche.\n\nEl problema real es que ptype_seq_next() y ptype_seq_show() violan las reglas RCU.\n\nptype_seq_show() se ejecuta bajo rcu_read_lock(), y lee pt-\u0026gt;dev para obtener el nombre del dispositivo sin ninguna barrera.\n\nAl mismo tiempo, los escritores concurrentes pueden eliminar una estructura packet_type (que se libera correctamente despu\u00e9s de un per\u00edodo de gracia RCU) y borrar pt-\u0026gt;dev sin un per\u00edodo de gracia RCU.\n\nDefinir ptype_iter_state para llevar un puntero dev junto con seq_net_private:\n\nstruct ptype_iter_state {\n\tstruct seq_net_private\tp;\n\tstruct net_device\t*dev; // a\u00f1adido en este parche\n};\n\nNecesitamos registrar el puntero del dispositivo en ptype_get_idx() y ptype_seq_next() para que ptype_seq_show() est\u00e9 a salvo de cambios concurrentes en pt-\u0026gt;dev.\n\nTambi\u00e9n necesitamos a\u00f1adir protecci\u00f3n RCU completa en ptype_seq_next().\n(Falta READ_ONCE() al leer los valores de list.next)\n\nMuchas gracias a Dong Chenchen por proporcionar una reproducci\u00f3n."
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                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.136",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.80",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.10",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.19",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add proper RCU protection to /proc/net/ptype\n\nYin Fengwei reported an RCU stall in ptype_seq_show() and provided\na patch.\n\nReal issue is that ptype_seq_next() and ptype_seq_show() violate\nRCU rules.\n\nptype_seq_show() runs under rcu_read_lock(), and reads pt-\u003edev\nto get device name without any barrier.\n\nAt the same time, concurrent writers can remove a packet_type structure\n(which is correctly freed after an RCU grace period) and clear pt-\u003edev\nwithout an RCU grace period.\n\nDefine ptype_iter_state to carry a dev pointer along seq_net_private:\n\nstruct ptype_iter_state {\n\tstruct seq_net_private\tp;\n\tstruct net_device\t*dev; // added in this patch\n};\n\nWe need to record the device pointer in ptype_get_idx() and\nptype_seq_next() so that ptype_seq_show() is safe against\nconcurrent pt-\u003edev changes.\n\nWe also need to add full RCU protection in ptype_seq_next().\n(Missing READ_ONCE() when reading list.next values)\n\nMany thanks to Dong Chenchen for providing a repro."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-01T16:10:57.558Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e974a10a52618f7f57a4bce173a0ed96acd4e5dc"
            },
            {
              "url": "https://git.kernel.org/stable/c/002a73470b56848e4c81efeaaedd471e92d66d8d"
            },
            {
              "url": "https://git.kernel.org/stable/c/dcefd3f0b9ed8288654c75254bdcee8e1085e861"
            },
            {
              "url": "https://git.kernel.org/stable/c/589a530ae44d0c80f523fcfd1a15af8087f27d35"
            },
            {
              "url": "https://git.kernel.org/stable/c/f613e8b4afea0cd17c7168e8b00e25bc8d33175d"
            }
          ],
          "title": "net: add proper RCU protection to /proc/net/ptype",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-23255",
        "datePublished": "2026-03-18T17:41:01.445Z",
        "dateReserved": "2026-01-13T15:37:45.990Z",
        "dateUpdated": "2026-11-10T12:42:05.778Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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