CVE-2026-97537 (GCVE-0-2026-97537)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:21 – Updated: 2026-09-28 05:31
VLAI
Title
scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 , < f35cb67f2092b49d7949065dd56895ed47238f22 (git)
Affected: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 , < 94fc0c5b45de2bf3a691619bcfd10b9a49fc647e (git)
Affected: 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 , < 34a40e0dff940ac5eba494a69b553ea571e24873 (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/scsi/qla2xxx/qla_mid.c"
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              "versionType": "git"
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          "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": "2026-09-28T05:31:01.867Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/34a40e0dff940ac5eba494a69b553ea571e24873"
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    "assignerShortName": "Linux",
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    "datePublished": "2026-09-25T10:21:35.608Z",
    "dateReserved": "2026-09-24T16:01:01.153Z",
    "dateUpdated": "2026-09-28T05:31:01.867Z",
    "state": "PUBLISHED"
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      "date": "2026-09-28",
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      "percentile": "0.08577"
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      "initial_release_date": "2026-09-27T23:36:20.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97537.json",
      "version": "1"
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        "descriptions": [
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            "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."
          }
        ],
        "id": "CVE-2026-97537",
        "lastModified": "2026-09-28T06:16:38.373",
        "metrics": {},
        "published": "2026-09-25T11:17:03.973",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97537.json",
      "version": "3"
    }
  }
}



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