CVE-2026-97502
Estado: RecibidaSin puntuar—
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:
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 either bit is set in qstatus while host->data is NULL, the kernel will crash inside the IRQ handler. smatch flags this:
Leer descripción completaMostrar menos
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.
Detalles técnicos trazas, registros y código del informe original
if (host->cmd == NULL && host->data == NULL) {
...
return IRQ_NONE;
}
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
...
}
drivers/mmc/host/davinci_mmc.c:933 mmc_davinci_irq() error: we
previously assumed 'data' could be null (see line 914)CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/3c5e3e5badbf0592332887d12db02458323682c3
- https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34
- https://git.kernel.org/stable/c/51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96
- https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577
- https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732
- https://git.kernel.org/stable/c/a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319
- https://git.kernel.org/stable/c/f216cf00e829895ff49bdf695c944915e59bd698
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-97502",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"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"
}
]
}
],
"published": "2026-09-24T17:17:27.963",
"references": [
{
"url": "https://git.kernel.org/stable/c/3c5e3e5badbf0592332887d12db02458323682c3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f216cf00e829895ff49bdf695c944915e59bd698",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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."
}
],
"lastModified": "2026-10-03T11:17:59.840",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}