CVE-2026-23454 (GCVE-0-2026-23454)
Vulnerability from cvelistv5
Published
2026-04-03 15:15
Modified
2026-05-11 22:07
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
Version: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/microsoft/mana/hw_channel.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
              "versionType": "semver"
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              "version": "5.15.203",
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              "version": "6.1.167",
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            },
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            },
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown\n\nA potential race condition exists in mana_hwc_destroy_channel() where\nhwc-\u003ecaller_ctx is freed before the HWC\u0027s Completion Queue (CQ) and\nEvent Queue (EQ) are destroyed. This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:07:18.149Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b88edf12fc3779521ae5f6f1584153b15f7da6df"
        },
        {
          "url": "https://git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448e"
        },
        {
          "url": "https://git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87"
        }
      ],
      "title": "net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23454",
    "datePublished": "2026-04-03T15:15:36.189Z",
    "dateReserved": "2026-01-13T15:37:46.020Z",
    "dateUpdated": "2026-05-11T22:07:18.149Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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