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mmc: davinci: avoid NULL deref of host->data in IRQ handler

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-97502

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-97502

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "f216cf00e829895ff49bdf695c944915e59bd698",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "3c5e3e5badbf0592332887d12db02458323682c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "a01cedf230dc0fcd55b994f5e548d3982ba4c732",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "5b7e151fe9ea9311ba601849aaecdc4fc97fd577",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b4cff4549b7a8c5fc8b88e3493b6287555f0512c",
        "lessThan": "4f28846aaf8db9668e338b8987973f8935edff34",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/mmc/host/davinci_mmc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.33"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.33",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/mmc/host/davinci_mmc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97502

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#8357 · Revision 1
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Publisher date
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Revision history

  1. CVE-2026-97502 · Revision 1Source updated