{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "a01cedf230dc0fcd55b994f5e548d3982ba4c732"
            },
            {
              "fixed": "5b7e151fe9ea9311ba601849aaecdc4fc97fd577"
            },
            {
              "fixed": "4f28846aaf8db9668e338b8987973f8935edff34"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.111"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97502.json"
  },
  "details": "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 'data' 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.",
  "id": "CVE-2026-97502",
  "modified": "2026-09-26T03:30:38.139706803Z",
  "published": "2026-09-24T16:04:49.056Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97502.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97502"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "mmc: davinci: avoid NULL deref of host-\u003edata in IRQ handler"
}