CVE-2026-23454 (GCVE-0-2026-23454)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-07-14 12:47
VLAI
Title
net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown A potential race condition exists in mana_hwc_destroy_channel() where hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt handler to dereference freed memory, leading to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp(). mana_smc_teardown_hwc() signals the hardware to stop but does not synchronize against IRQ handlers already executing on other CPUs. The IRQ synchronization only happens in mana_hwc_destroy_cq() via mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler() can dereference freed caller_ctx (and rxq->msg_buf) in mana_hwc_handle_resp(). Fix this by reordering teardown to reverse-of-creation order: destroy the TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This ensures all in-flight interrupt handlers complete before the memory they access is freed.
Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < b88edf12fc3779521ae5f6f1584153b15f7da6df (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < e23bf444512cb85d76012080a76cd1f9e967448e (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 249e905571583a434d4ea8d6f92ccc0eef337115 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 2b001901f689021acd7bf2dceed74a1bdcaaa1f9 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < afdb1533eb9c05432aeb793a7280fa827c502f5c (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 05d345719d85b927cba74afac4d5322de3aa4256 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < fa103fc8f56954a60699a29215cb713448a39e87 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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The\\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\\nmana_gd_destroy_eq() -\u003e mana_gd_deregister_irq(). Since this runs\\nafter kfree(hwc-\u003ecaller_ctx), a concurrent mana_hwc_rx_event_handler()\\ncan dereference freed caller_ctx (and rxq-\u003emsg_buf) in\\nmana_hwc_handle_resp().\\n\\nFix this by reordering teardown to reverse-of-creation order: destroy\\nthe TX/RX work queues and CQ/EQ before freeing hwc-\u003ecaller_ctx. This\\nensures all in-flight interrupt handlers complete before the memory they\\naccess is freed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet: mana: corrige uso despu\u00e9s de liberaci\u00f3n en mana_hwc_destroy_channel() reordenando el desmantelamiento\\n\\nExiste una potencial condici\u00f3n de carrera en mana_hwc_destroy_channel() donde hwc -\u003e caller_ctx es liberado antes de que la Cola de Completado (CQ) y la Cola de Eventos (EQ) del HWC sean destruidas. Esto permite a un gestor de interrupciones de CQ en curso desreferenciar memoria liberada, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n o a una desreferencia de puntero NULL en mana_hwc_handle_resp().\\n\\nmana_smc_teardown_hwc() le indica al hardware que se detenga pero no se sincroniza con los gestores de IRQ que ya se est\u00e1n ejecutando en otras CPUs. La sincronizaci\u00f3n de IRQ solo ocurre en mana_hwc_destroy_cq() a trav\u00e9s de mana_gd_destroy_eq()  -\u003e  mana_gd_deregister_irq(). Dado que esto se ejecuta despu\u00e9s de kfree(hwc -\u003e caller_ctx), un mana_hwc_rx_event_handler() concurrente puede desreferenciar caller_ctx liberado (y rxq -\u003e msg_buf) en mana_hwc_handle_resp().\\n\\nSolucione esto reordenando el desmantelamiento al orden inverso de creaci\u00f3n: destruya las colas de trabajo TX/RX y CQ/EQ antes de liberar hwc -\u003e caller_ctx. Esto asegura que todos los gestores de interrupciones en curso se completen antes de que la memoria a la que acceden sea 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:21:06+00:00",
      "cve": "CVE-2026-23454",
      "id": "CVE-2026-23454",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23454.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:28:11Z",
      "cve": "CVE-2026-23454",
      "id": "CVE-2026-23454",
      "initial_release_date": "2026-04-03T23:27:26Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "239",
      "product_status:known_not_affected": "15",
      "product_status:recommended": "244",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23454",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23454.json",
      "version": "10"
    }
  }
}



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Taxonomy of the tags.





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.