CVE-2026-97502 (GCVE-0-2026-97502)
Vulnerability from cvelistv5 – Published: 2026-09-24 16:04 – Updated: 2026-10-03 10:59
VLAI
EPSS
VEX
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
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < 51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96
(git)
Affected: b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < f216cf00e829895ff49bdf695c944915e59bd698 (git) Affected: b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319 (git) Affected: b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < 3c5e3e5badbf0592332887d12db02458323682c3 (git) Affected: b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < a01cedf230dc0fcd55b994f5e548d3982ba4c732 (git) Affected: b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < 5b7e151fe9ea9311ba601849aaecdc4fc97fd577 (git) Affected: b4cff4549b7a8c5fc8b88e3493b6287555f0512c , < 4f28846aaf8db9668e338b8987973f8935edff34 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.33
Unaffected: 0 , < 2.6.33 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/mmc/host/davinci_mmc.c"
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}
]
},
{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "2.6.33"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.158",
"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": "5.10.271",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.222",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.189",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.158",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"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-\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": "2026-10-03T10:59:02.767Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "mmc: davinci: avoid NULL deref of host-\u003edata 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": "2026-10-03T10:59:02.767Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-97502",
"date": "2026-11-15",
"epss": "0.00161",
"percentile": "0.05305"
},
"microsoft_vex": {
"current_release_date": "2026-10-21T18:33:46.000Z",
"cve": "CVE-2026-97502",
"id": "msrc_CVE-2026-97502",
"initial_release_date": "2026-09-28T03:53:49.000Z",
"product_status:known_not_affected": "1",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "mmc: davinci: avoid NULL deref of host-\u003edata in IRQ handler",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97502.json",
"version": "3"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"versionType": "git"
},
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"versionType": "git"
},
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "5.15.222",
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},
{
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"version": "6.1.189",
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},
{
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"versionType": "semver"
},
{
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},
{
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"version": "7.2",
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}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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."
}
],
"id": "CVE-2026-97502",
"lastModified": "2026-10-03T11:17:59.840",
"metrics": {},
"published": "2026-09-24T17:17:27.963",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T02:22:57+00:00",
"cve": "CVE-2026-97502",
"id": "CVE-2026-97502",
"initial_release_date": "2026-09-24T00:00:00+00:00",
"product_status:known_not_affected": "203",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: mmc: davinci: avoid NULL deref of host-\u003edata in IRQ handler",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97502.json",
"version": "3"
}
}
}
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