CVE-2026-92514 (GCVE-0-2026-92514)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Fix CEQ tasklet use-after-free on removal Each CEQ interrupt handler only schedules eqc->tasklet. The tasklet calls erdma_ceq_completion_handler(), which reads the DMA-coherent EQ ring through get_next_valid_eqe() and updates eq->dbrec through notify_eq(). erdma_ceqs_uninit() frees each CEQ IRQ and then destroys its EQ. free_irq() prevents another hard IRQ and waits for an in-flight handler, but it does not drain a tasklet that the handler already scheduled. The tasklet can therefore access eq->qbuf or eq->dbrec after erdma_eq_destroy() frees them. Clearing ceq_cb->ready does not synchronize with a tasklet that already passed the check at the start of erdma_ceq_completion_handler(). Kill the tasklet after free_irq(), when no handler can schedule it again, and before erdma_ceq_uninit_one() releases the EQ buffers.
References
Impacted products
Vendor Product Version
Linux Linux Version: f2a0a630b953451a59a2612ad8c29246638f0a38
Version: f2a0a630b953451a59a2612ad8c29246638f0a38
Version: f2a0a630b953451a59a2612ad8c29246638f0a38
Version: f2a0a630b953451a59a2612ad8c29246638f0a38
Version: f2a0a630b953451a59a2612ad8c29246638f0a38
Version: f2a0a630b953451a59a2612ad8c29246638f0a38
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_eq.c"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Fix CEQ tasklet use-after-free on removal\n\nEach CEQ interrupt handler only schedules eqc-\u003etasklet. The tasklet calls\nerdma_ceq_completion_handler(), which reads the DMA-coherent EQ ring\nthrough get_next_valid_eqe() and updates eq-\u003edbrec through notify_eq().\n\nerdma_ceqs_uninit() frees each CEQ IRQ and then destroys its EQ.\nfree_irq() prevents another hard IRQ and waits for an in-flight handler,\nbut it does not drain a tasklet that the handler already scheduled. The\ntasklet can therefore access eq-\u003eqbuf or eq-\u003edbrec after\nerdma_eq_destroy() frees them.\n\nClearing ceq_cb-\u003eready does not synchronize with a tasklet that already\npassed the check at the start of erdma_ceq_completion_handler().\n\nKill the tasklet after free_irq(), when no handler can schedule it again,\nand before erdma_ceq_uninit_one() releases the EQ buffers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:20.857Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0e8b78dabb1f156db05ffe74c6eae861167c7c21"
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        {
          "url": "https://git.kernel.org/stable/c/6e129c1310abfa786a510cc63e69c5ef12349048"
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        {
          "url": "https://git.kernel.org/stable/c/f738c0a372d36a10dfae6dc357717c13b2aa72f4"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/0ca79979384f031d710c4b3bae065dcb5d95aca3"
        }
      ],
      "title": "RDMA/erdma: Fix CEQ tasklet use-after-free on removal",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92514",
    "datePublished": "2026-09-17T16:10:23.462Z",
    "dateReserved": "2026-09-16T12:21:13.873Z",
    "dateUpdated": "2026-10-19T09:04:20.857Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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