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

Vulnerability from cvelistv5 – Published: 2026-03-18 17:41 – Updated: 2026-06-01 16:10
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e974a10a52618f7f57a4bce173a0ed96acd4e5dc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 002a73470b56848e4c81efeaaedd471e92d66d8d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dcefd3f0b9ed8288654c75254bdcee8e1085e861 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 589a530ae44d0c80f523fcfd1a15af8087f27d35 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f613e8b4afea0cd17c7168e8b00e25bc8d33175d (git)
Create a notification for this product.
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)
Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23255\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-18T18:16:23.687\",\"lastModified\":\"2026-06-17T10:21:11.773\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"},{\"lang\":\"es\",\"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 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    "redhat_vex": {
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      "current_release_date": "2026-06-28T07:19:46+00:00",
      "cve": "CVE-2026-23255",
      "id": "CVE-2026-23255",
      "initial_release_date": "2026-03-18T00:00:00+00:00",
      "product_status:known_affected": "260",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: add proper RCU protection to /proc/net/ptype",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23255.json",
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    },
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      "current_release_date": "2026-07-19T17:43:16Z",
      "cve": "CVE-2026-23255",
      "id": "CVE-2026-23255",
      "initial_release_date": "2026-03-19T00:27:04Z",
      "product_status:first_fixed": "2",
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      "product_status:recommended": "325",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23255",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23255.json",
      "version": "34"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.