CVE-2024-26826 (GCVE-0-2024-26826)

Vulnerability from cvelistv5 – Published: 2024-04-17 09:43 – Updated: 2026-08-05 11:27
VLAI
Title
mptcp: fix data re-injection from stale subflow
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix data re-injection from stale subflow When the MPTCP PM detects that a subflow is stale, all the packet scheduler must re-inject all the mptcp-level unacked data. To avoid acquiring unneeded locks, it first try to check if any unacked data is present at all in the RTX queue, but such check is currently broken, as it uses TCP-specific helper on an MPTCP socket. Funnily enough fuzzers and static checkers are happy, as the accessed memory still belongs to the mptcp_sock struct, and even from a functional perspective the recovery completed successfully, as the short-cut test always failed. A recent unrelated TCP change - commit d5fed5addb2b ("tcp: reorganize tcp_sock fast path variables") - exposed the issue, as the tcp field reorganization makes the mptcp code always skip the re-inection. Fix the issue dropping the bogus call: we are on a slow path, the early optimization proved once again to be evil.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1e1d9d6f119c55c05e8ea78ed3e49046690abffd , < 6f95120f898b40d13fd441225ef511307853c9c2 (git)
Affected: 1e1d9d6f119c55c05e8ea78ed3e49046690abffd , < 6673d9f1c2cd984390550dbdf7d5ae07b20abbf8 (git)
Affected: 1e1d9d6f119c55c05e8ea78ed3e49046690abffd , < b609c783c535493aa3fca22c7e40a120370b1ca5 (git)
Affected: 1e1d9d6f119c55c05e8ea78ed3e49046690abffd , < 624902eab7abcb8731b333ec73f206d38d839cd8 (git)
Affected: 1e1d9d6f119c55c05e8ea78ed3e49046690abffd , < b6c620dc43ccb4e802894e54b651cf81495e9598 (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Para evitar adquirir bloqueos innecesarios, primero intenta verificar si hay datos no bloqueados presentes en la cola RTX, pero dicha verificaci\u00f3n actualmente no funciona, ya que utiliza un asistente espec\u00edfico de TCP en un socket MPTCP. Curiosamente, los fuzzers y los comprobadores est\u00e1ticos est\u00e1n contentos, ya que la memoria a la que se accede todav\u00eda pertenece a la estructura mptcp_sock, e incluso desde una perspectiva funcional la recuperaci\u00f3n se complet\u00f3 con \u00e9xito, ya que la prueba de acceso directo siempre fallaba. Un cambio reciente de TCP no relacionado (commit d5fed5addb2b (\\\"tcp: reorganizar las variables de ruta r\u00e1pida de tcp_sock\\\")) expuso el problema, ya que la reorganizaci\u00f3n del campo tcp hace que el c\u00f3digo mptcp siempre omita la reinecci\u00f3n. Solucione el problema eliminando la llamada falsa: estamos en un camino lento, la optimizaci\u00f3n inicial demostr\u00f3 una vez m\u00e1s ser 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:10:26+00:00",
      "cve": "CVE-2024-26826",
      "id": "CVE-2024-26826",
      "initial_release_date": "2024-04-17T00:00:00+00:00",
      "product_status:fixed": "929",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "51",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mptcp: fix data re-injection from stale subflow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26826.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T01:55:51Z",
      "cve": "CVE-2024-26826",
      "id": "CVE-2024-26826",
      "initial_release_date": "2024-04-19T02:18:44Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "335",
      "product_status:recommended": "407",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26826",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26826.json",
      "version": "75"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2024-26826\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:27:40.642Z\", \"dateReserved\": \"2024-02-19T14:20:24.181Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T09:43:51.741Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.