Medium [CVE-2026-64124] reject dma-buf bind with non-page-aligned size or SG length
This medium-severity Red Hat Linux advisory covers CVE-2026-64124.
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Summary
In the Linux kernel, the following vulnerability has been resolved: net: devmem: reject dma-buf bind with non-page-aligned size or SG length net_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be PAGE_SIZE multiples without checking: - tx_vec is sized dmabuf->size / PAGE_SIZE, and net_devmem_get_niov_at() only bounds-checks virt_addr size before indexing tx_vec[virt_addr / PAGE_SIZE].
With size = N*PAGE_SIZE + r (1 area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner() covers the full byte len, so a non-page-multiple non-final sg desyncs num_niovs from the gen_pool region for every later sg, on both RX and TX. dma-buf does not require page-aligned sizes, so the bind path has to enforce what its own indexing assumes.
Reject both with -EINVAL. A flaw was found in the Linux kernel's network device memory (net: devmem) component.
This vulnerability allows an attacker to trigger an out-of-bounds read by providing specially crafted Direct Memory Access (DMA) buffers with non-page-aligned sizes or Scatter-Gather (SG) list lengths. This could lead to information disclosure or memory corruption, potentially impacting system stability and data integrity.
Red Hat severity: Moderate. Weakness: CWE-125.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
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