CVE-2026-97537 (GCVE-0-2026-97537)
Vulnerability from cvelistv5
Published
2026-09-25 10:21
Modified
2026-10-21 12:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking qla25xx_free_req_que() and qla25xx_free_rsp_que() have two pre-existing bugs exposed on the error path of qla25xx_create_{req,rsp}_que(): 1. When dma_alloc_coherent() fails during queue creation, the error path calls the free function with req->ring / rsp->ring still NULL (from kzalloc). The unconditional dma_free_coherent() with a NULL cpu_addr is undefined behavior and can panic. 2. The free functions clear req_qid_map / rsp_qid_map under vport_lock, but the create functions protect the same bitmaps with mq_lock. This provides no mutual exclusion. Additionally, the create error path clears the bit and releases mq_lock before calling the free function, creating a window where another thread can allocate the same que_id and have its ha->req_q_map entry clobbered by the subsequent lockless NULL assignment in the free function. Fix by: - Guarding dma_free_coherent() with a NULL check on the ring pointer. - Using mq_lock (the lock held by all creators) in the free functions to atomically NULL the map entry and clear the bitmap bit. - Removing the now-redundant clear_bit blocks from the create error paths since the free functions handle it atomically.
References
Impacted products
Vendor Product Version
Linux Linux Version: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8
Version: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8
Version: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8
Version: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8
Version: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/scsi/qla2xxx/qla_mid.c"
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              "status": "unaffected",
              "version": "6.18.53",
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              "version": "7.2.7",
              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking\n\nqla25xx_free_req_que() and qla25xx_free_rsp_que() have two pre-existing\nbugs exposed on the error path of qla25xx_create_{req,rsp}_que():\n\n 1. When dma_alloc_coherent() fails during queue creation, the error\n    path calls the free function with req-\u003ering / rsp-\u003ering still NULL\n    (from kzalloc).  The unconditional dma_free_coherent() with a NULL\n    cpu_addr is undefined behavior and can panic.\n\n 2. The free functions clear req_qid_map / rsp_qid_map under vport_lock,\n    but the create functions protect the same bitmaps with mq_lock.\n    This provides no mutual exclusion.  Additionally, the create error\n    path clears the bit and releases mq_lock before calling the free\n    function, creating a window where another thread can allocate the\n    same que_id and have its ha-\u003ereq_q_map entry clobbered by the\n    subsequent lockless NULL assignment in the free function.\n\nFix by:\n\n - Guarding dma_free_coherent() with a NULL check on the ring pointer.\n\n - Using mq_lock (the lock held by all creators) in the free functions\n   to atomically NULL the map entry and clear the bitmap bit.\n\n - Removing the now-redundant clear_bit blocks from the create error\n   paths since the free functions handle it atomically."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:53:12.722Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2e6f60adf609c77e828f64e0cd371920bef91c12"
        },
        {
          "url": "https://git.kernel.org/stable/c/56e25d716833604fd5bff388e472f290bfe793aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/f35cb67f2092b49d7949065dd56895ed47238f22"
        },
        {
          "url": "https://git.kernel.org/stable/c/94fc0c5b45de2bf3a691619bcfd10b9a49fc647e"
        },
        {
          "url": "https://git.kernel.org/stable/c/34a40e0dff940ac5eba494a69b553ea571e24873"
        }
      ],
      "title": "scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97537",
    "datePublished": "2026-09-25T10:21:35.608Z",
    "dateReserved": "2026-09-24T16:01:01.153Z",
    "dateUpdated": "2026-10-21T12:53:12.722Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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