CVE-2026-23136 (GCVE-0-2026-23136)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:22 – Updated: 2026-08-05 12:20
VLAI
Title
libceph: reset sparse-read state in osd_fault()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: reset sparse-read state in osd_fault() When a fault occurs, the connection is abandoned, reestablished, and any pending operations are retried. The OSD client tracks the progress of a sparse-read reply using a separate state machine, largely independent of the messenger's state. If a connection is lost mid-payload or the sparse-read state machine returns an error, the sparse-read state is not reset. The OSD client will then interpret the beginning of a new reply as the continuation of the old one. If this makes the sparse-read machinery enter a failure state, it may never recover, producing loops like: libceph: [0] got 0 extents libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read Therefore, reset the sparse-read state in osd_fault(), ensuring retries start from a clean state.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f628d799972799023d32c2542bb2639eb8c4f84e , < 90a60fe61908afa0eaf7f8fcf1421b9b50e5f7ff (git)
Affected: f628d799972799023d32c2542bb2639eb8c4f84e , < e94075e950a6598e710b9f7dffea5aa388f40313 (git)
Affected: f628d799972799023d32c2542bb2639eb8c4f84e , < 10b7c72810364226f7b27916ea3e2a4f870bc04b (git)
Affected: f628d799972799023d32c2542bb2639eb8c4f84e , < 11194b416ef95012c2cfe5f546d71af07b639e93 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.121 , ≤ 6.6.* (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: reset sparse-read state in osd_fault()\n\nWhen a fault occurs, the connection is abandoned, reestablished, and any\npending operations are retried. The OSD client tracks the progress of a\nsparse-read reply using a separate state machine, largely independent of\nthe messenger\u0027s state.\n\nIf a connection is lost mid-payload or the sparse-read state machine\nreturns an error, the sparse-read state is not reset. The OSD client\nwill then interpret the beginning of a new reply as the continuation of\nthe old one. If this makes the sparse-read machinery enter a failure\nstate, it may never recover, producing loops like:\n\n  libceph:  [0] got 0 extents\n  libceph: data len 142248331 != extent len 0\n  libceph: osd0 (1)...:6801 socket error on read\n  libceph: data len 142248331 != extent len 0\n  libceph: osd0 (1)...:6801 socket error on read\n\nTherefore, reset the sparse-read state in osd_fault(), ensuring retries\nstart from a clean state."
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              "value": "AV:N - The Ceph OSD client communicates with OSD servers over TCP. A network-level attacker who can disrupt the TCP connection (RST injection) or a malicious/compromised OSD server can trigger the fault during a sparse read operation remotely.\nAC:L - Sparse reads are a normal part of CephFS/RBD operation. An attacker who can disrupt TCP connections can repeatedly do so until one coincides with a sparse read. A malicious OSD server knows exactly when sparse reads are in progress and can reliably trigger the fault.\nPR:N - The attack requires disrupting the TCP connection between client and OSD, which does not require any Ceph authentication credentials. TCP RST injection or network-level connection disruption bypasses CephX authentication entirely.\nUI:N - No user interaction is required. The sparse read operations occur as part of normal CephFS/RBD I/O, and the connection fault is triggered by the attacker without any victim action.\nS:U - The impact is confined to the kernel\u0027s Ceph client losing access to the OSD. There is no cross-boundary impact such as VM escape or sandbox escape.\nC:N - The vulnerability causes a data parsing mismatch that is caught by validation checks, returning clean errors. No information disclosure occurs \u2014 the stale state causes misinterpretation of reply framing, not exposure of memory contents.\nI:N - No data modification or memory corruption occurs. The validation checks in the sparse read state machine detect the mismatch and return -EREMOTEIO before any data is written to incorrect locations.\nA:H - The OSD connection enters an infinite, unrecoverable error loop where every retry fails with the same stale state mismatch. All CephFS/RBD I/O to the affected OSD hangs or fails indefinitely, causing persistent denial of service."
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    "dateReserved": "2026-01-13T15:37:45.971Z",
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If this makes the sparse-read machinery enter a failure\\nstate, it may never recover, producing loops like:\\n\\n  libceph:  [0] got 0 extents\\n  libceph: data len 142248331 != extent len 0\\n  libceph: osd0 (1)...:6801 socket error on read\\n  libceph: data len 142248331 != extent len 0\\n  libceph: osd0 (1)...:6801 socket error on read\\n\\nTherefore, reset the sparse-read state in osd_fault(), ensuring retries\\nstart from a clean state.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nlibceph: restablecer el estado de lectura dispersa en osd_fault()\\n\\nCuando ocurre un fallo, la conexi\u00f3n es abandonada, restablecida, y cualquier operaci\u00f3n pendiente es reintentada. El cliente OSD rastrea el progreso de una respuesta de lectura dispersa usando una m\u00e1quina de estados separada, en gran medida independiente del estado del mensajero.\\n\\nSi se pierde una conexi\u00f3n a mitad de la carga \u00fatil o la m\u00e1quina de estados de lectura dispersa devuelve un error, el estado de lectura dispersa no se restablece. El cliente OSD interpretar\u00e1 entonces el comienzo de una nueva respuesta como la continuaci\u00f3n de la antigua. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-07T21:55:15+00:00",
      "cve": "CVE-2026-23136",
      "id": "CVE-2026-23136",
      "initial_release_date": "2026-02-14T00:00:00+00:00",
      "product_status:fixed": "1218",
      "product_status:known_affected": "98",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in libceph OSD client due to unreset sparse-read state",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23136.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • 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.


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