{"id":"CVE-2026-97502","state":"PUBLISHED","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.","publishedAt":"2026-09-24T16:04:49.056Z","updatedAt":"2026-10-03T10:59:02.767Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"f216cf00e829895ff49bdf695c944915e59bd698","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"3c5e3e5badbf0592332887d12db02458323682c3","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"a01cedf230dc0fcd55b994f5e548d3982ba4c732","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"5b7e151fe9ea9311ba601849aaecdc4fc97fd577","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"4f28846aaf8db9668e338b8987973f8935edff34","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mmc/host/davinci_mmc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mmc/host/davinci_mmc.c"]}],"references":["https://git.kernel.org/stable/c/51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96","https://git.kernel.org/stable/c/f216cf00e829895ff49bdf695c944915e59bd698","https://git.kernel.org/stable/c/a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319","https://git.kernel.org/stable/c/3c5e3e5badbf0592332887d12db02458323682c3","https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732","https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577","https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97502.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97502","state":"PUBLISHED","datePublished":"2026-09-24T16:04:49.056Z","dateUpdated":"2026-10-03T10:59:02.767Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T16:01:01.151Z"},"containers":{"cna":{"title":"mmc: davinci: avoid NULL deref of host->data in IRQ handler","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"f216cf00e829895ff49bdf695c944915e59bd698","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"3c5e3e5badbf0592332887d12db02458323682c3","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"a01cedf230dc0fcd55b994f5e548d3982ba4c732","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"5b7e151fe9ea9311ba601849aaecdc4fc97fd577","versionType":"git"},{"version":"b4cff4549b7a8c5fc8b88e3493b6287555f0512c","status":"affected","lessThan":"4f28846aaf8db9668e338b8987973f8935edff34","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mmc/host/davinci_mmc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mmc/host/davinci_mmc.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:59:02.767Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}