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

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Summary

CVECVE-2026-97502
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:27 UTC
Updated2026-09-28 06:16:36 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.039120000 (date 2026-09-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c a01cedf230dc0fcd55b994f5e548d3982ba4c732 git Not specified
CNA Linux Linux affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c 5b7e151fe9ea9311ba601849aaecdc4fc97fd577 git Not specified
CNA Linux Linux affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c 4f28846aaf8db9668e338b8987973f8935edff34 git Not specified
CNA Linux Linux affected 2.6.33 Not specified
CNA Linux Linux unaffected 2.6.33 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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