CVE-2026-97502 (GCVE-0-2026-97502)
Vulnerability from cvelistv5
Published
2026-09-24 16:04
Modified
2026-10-03 10:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mmc: davinci: avoid NULL deref of host->data in IRQ handler mmc_davinci_irq() returns early only when both host->cmd and host->data are NULL: if (host->cmd == NULL && host->data == NULL) { ... return IRQ_NONE; } So we may legitimately reach the rest of the handler with host->data == NULL (and therefore data == NULL). The DATDNE branch already guards against this with an explicit "if (data != NULL)" check, but the subsequent TOUTRD ("read data timeout") and CRCWR/CRCRD ("data CRC error") branches dereference data unconditionally: if (qstatus & MMCST0_TOUTRD) { data->error = -ETIMEDOUT; <-- NULL deref ... davinci_abort_data(host, data); } if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) { data->error = -EILSEQ; <-- NULL deref ... } If either bit is set in qstatus while host->data is NULL, the kernel will crash inside the IRQ handler. smatch flags this: drivers/mmc/host/davinci_mmc.c:933 mmc_davinci_irq() error: we previously assumed 'data' could be null (see line 914) Gate both branches on a non-NULL data, matching the existing pattern used by the DATDNE branch. No functional change for callers where data is non-NULL, which is the only case in which these branches did meaningful work before this change.
References
Impacted products
Vendor Product Version
Linux Linux Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
Version: b4cff4549b7a8c5fc8b88e3493b6287555f0512c
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/davinci_mmc.c"
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          "programFiles": [
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          ],
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          "vendor": "Linux",
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              "version": "0",
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              "lessThanOrEqual": "6.18.*",
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              "lessThanOrEqual": "*",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: davinci: avoid NULL deref of host-\u003edata in IRQ handler\n\nmmc_davinci_irq() returns early only when both host-\u003ecmd and\nhost-\u003edata are NULL:\n\n  if (host-\u003ecmd == NULL \u0026\u0026 host-\u003edata == NULL) {\n          ...\n          return IRQ_NONE;\n  }\n\nSo we may legitimately reach the rest of the handler with\nhost-\u003edata == NULL (and therefore data == NULL). The DATDNE branch\nalready guards against this with an explicit \"if (data != NULL)\"\ncheck, but the subsequent TOUTRD (\"read data timeout\") and\nCRCWR/CRCRD (\"data CRC error\") branches dereference data\nunconditionally:\n\n  if (qstatus \u0026 MMCST0_TOUTRD) {\n          data-\u003eerror = -ETIMEDOUT;        \u003c-- NULL deref\n          ...\n          davinci_abort_data(host, data);\n  }\n\n  if (qstatus \u0026 (MMCST0_CRCWR | MMCST0_CRCRD)) {\n          data-\u003eerror = -EILSEQ;           \u003c-- NULL deref\n          ...\n  }\n\nIf either bit is set in qstatus while host-\u003edata is NULL, the kernel\nwill crash inside the IRQ handler. smatch flags this:\n\n  drivers/mmc/host/davinci_mmc.c:933 mmc_davinci_irq() error: we\n    previously assumed \u0027data\u0027 could be null (see line 914)\n\nGate both branches on a non-NULL data, matching the existing pattern\nused by the DATDNE branch.\n\nNo functional change for callers where data is non-NULL, which is\nthe only case in which these branches did meaningful work before\nthis change."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:59:02.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96"
        },
        {
          "url": "https://git.kernel.org/stable/c/f216cf00e829895ff49bdf695c944915e59bd698"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c5e3e5badbf0592332887d12db02458323682c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34"
        }
      ],
      "title": "mmc: davinci: avoid NULL deref of host-\u003edata in IRQ handler",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97502",
    "datePublished": "2026-09-24T16:04:49.056Z",
    "dateReserved": "2026-09-24T16:01:01.151Z",
    "dateUpdated": "2026-10-03T10:59:02.767Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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