{"api_version":"1","generated_at":"2026-10-02T03:44:40+00:00","cve":"CVE-2026-97502","urls":{"html":"https://cve.report/CVE-2026-97502","api":"https://cve.report/api/cve/CVE-2026-97502.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97502","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97502"},"summary":{"title":"mmc: davinci: avoid NULL deref of host->data in IRQ handler","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: davinci: avoid NULL deref of host->data in IRQ handler\n\nmmc_davinci_irq() returns early only when both host->cmd and\nhost->data are NULL:\n\n  if (host->cmd == NULL && host->data == NULL) {\n          ...\n          return IRQ_NONE;\n  }\n\nSo we may legitimately reach the rest of the handler with\nhost->data == 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 & MMCST0_TOUTRD) {\n          data->error = -ETIMEDOUT;        <-- NULL deref\n          ...\n          davinci_abort_data(host, data);\n  }\n\n  if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {\n          data->error = -EILSEQ;           <-- NULL deref\n          ...\n  }\n\nIf either bit is set in qstatus while host->data 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 17:17:27","updated_at":"2026-09-28 06:16:36"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577","name":"https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34","name":"https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732","name":"https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97502","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97502","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c a01cedf230dc0fcd55b994f5e548d3982ba4c732 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c 5b7e151fe9ea9311ba601849aaecdc4fc97fd577 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c 4f28846aaf8db9668e338b8987973f8935edff34 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.33","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.33 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"97502","cve":"CVE-2026-97502","epss":"0.001550000","percentile":"0.039120000","score_date":"2026-09-29","updated_at":"2026-09-30 00:11:23"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","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":[{"lessThan":"a01cedf230dc0fcd55b994f5e548d3982ba4c732","status":"affected","version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","versionType":"git"},{"lessThan":"5b7e151fe9ea9311ba601849aaecdc4fc97fd577","status":"affected","version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","versionType":"git"},{"lessThan":"4f28846aaf8db9668e338b8987973f8935edff34","status":"affected","version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","versionType":"git"}]},{"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":[{"status":"affected","version":"2.6.33"},{"lessThan":"2.6.33","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"2.6.33","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"2.6.33","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"2.6.33","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->data in IRQ handler\n\nmmc_davinci_irq() returns early only when both host->cmd and\nhost->data are NULL:\n\n  if (host->cmd == NULL && host->data == NULL) {\n          ...\n          return IRQ_NONE;\n  }\n\nSo we may legitimately reach the rest of the handler with\nhost->data == 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 & MMCST0_TOUTRD) {\n          data->error = -ETIMEDOUT;        <-- NULL deref\n          ...\n          davinci_abort_data(host, data);\n  }\n\n  if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {\n          data->error = -EILSEQ;           <-- NULL deref\n          ...\n  }\n\nIf either bit is set in qstatus while host->data 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."}],"providerMetadata":{"dateUpdated":"2026-09-28T05:30:36.351Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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->data 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":"2026-09-28T05:30:36.351Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 17:17:27","lastModifiedDate":"2026-09-28 06:16:36","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97502","Ordinal":"1","Title":"mmc: davinci: avoid NULL deref of host->data in IRQ handler","CVE":"CVE-2026-97502","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97502","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: davinci: avoid NULL deref of host->data in IRQ handler\n\nmmc_davinci_irq() returns early only when both host->cmd and\nhost->data are NULL:\n\n  if (host->cmd == NULL && host->data == NULL) {\n          ...\n          return IRQ_NONE;\n  }\n\nSo we may legitimately reach the rest of the handler with\nhost->data == 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 & MMCST0_TOUTRD) {\n          data->error = -ETIMEDOUT;        <-- NULL deref\n          ...\n          davinci_abort_data(host, data);\n  }\n\n  if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {\n          data->error = -EILSEQ;           <-- NULL deref\n          ...\n  }\n\nIf either bit is set in qstatus while host->data 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.","Type":"Description","Title":"mmc: davinci: avoid NULL deref of host->data in IRQ handler"}]}}}