CVE-2026-93233
UnknownSummary
Vulnerability in the Nouveau driver (drm/nouveau/dmem) causes an underflow of the callocated counter when a large folio is split. The counter is not updated on split, leading to memory leak and warnings. The fix accounts for new sub-folios in the split hook.
Risk Assessment
Risk of improper memory management may lead to memory exhaustion or system instability.
Recommendation
Apply a Linux kernel update containing the fix. If not possible, restrict usage of large folio features.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/dmem: fix callocated underflow on large folio split nouveau_dmem_folio_free() drops chunk->callocated once per freed folio, while a large (compound) device-private folio is only counted once when it is allocated. When such a folio is split, the mm core invokes ->folio_split() (nouveau_dmem_folio_split()) once for each new sub-folio, but the hook only fixes up the sub-folio metadata and leaves chunk->callocated unchanged. Each resulting sub-folio is later freed separately, so after a split the single allocation (+1) is met by N frees (-N), leaving chunk->callocated short by N-1. On the first split/free cycle it underflows: WARN_ON(!chunk->callocated) fires, the unsigned counter wraps and never returns to zero, so the chunk can no longer be reclaimed (nouveau_dmem_fini() also warns on the leaked count). Account for the new sub-folio in the split hook, under the same lock as nouveau_dmem_folio_free(), so the count stays balanced.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS