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GHSA-7J63-M3C7-G76R

Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-97502"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-24T17:17:27Z",
    "severity": null
  },
  "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 \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.",
  "id": "GHSA-7j63-m3c7-g76r",
  "modified": "2026-09-24T18:31:35Z",
  "published": "2026-09-24T18:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97502"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-97502 (GCVE-0-2026-97502)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:04 – Updated: 2026-09-24 16:04

Title

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

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/a01cedf230dc0fcd5…
https://git.kernel.org/stable/c/5b7e151fe9ea9311b…
https://git.kernel.org/stable/c/4f28846aaf8db9668…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a01cedf230dc0fcd55b994f5e548d3982ba4c732 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5b7e151fe9ea9311ba601849aaecdc4fc97fd577 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4f28846aaf8db9668e338b8987973f8935edff34 (git) Affected: 0 , < 6.12.111 (semver) Affected: 0 , < 6.18.53 (semver)
Linux	Linux	Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/davinci_mmc.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "5b7e151fe9ea9311ba601849aaecdc4fc97fd577",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "4f28846aaf8db9668e338b8987973f8935edff34",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/davinci_mmc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "vulnerable": true
                }
              ],
              "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": "2026-09-24T16:04:49.056Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34"
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      "title": "mmc: davinci: avoid NULL deref of host-\u003edata in IRQ handler",
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    "datePublished": "2026-09-24T16:04:49.056Z",
    "dateReserved": "2026-09-24T16:01:01.151Z",
    "dateUpdated": "2026-09-24T16:04:49.056Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-7J63-M3C7-G76R

CVE-2026-97502 (GCVE-0-2026-97502)

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