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skip_block_zeroing
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- 1Cloudflare Containers flaw exposed cross-tenant data fragments●Discover how a Cloudflare Containers data flaw exposed cross-tenant fragments. Learn about the skip_block_zeroing thin p
A reported vulnerability in Cloudflare Containers may have allowed fragments of one customer's data to be visible to another tenant. The issue is linked to a thin provisioning weakness known as skip_block_zeroing, where storage blocks are not properly zeroed before reuse. Security commentators are discussing how such flaws arise in shared cloud infrastructure and what they mean for container isolation and multi-tenant data protection.
- 2Cloudflare fixes cross-tenant data exposure in Containers sandboxes●🤖 Cloudflare Containers/Sandboxes cross-tenant data exposure: dm-thin storage pools ran with skip_block_zeroing, so a Wo
A cross-tenant data exposure flaw in Cloudflare's Containers and Sandboxes has been disclosed and fixed. The issue stemmed from dm-thin storage pools running with skip_block_zeroing enabled, meaning newly written 4 KiB pages into unmapped 64 KiB blocks could leave residual data on raw devices. A Workers Paid tenant could reportedly read up to 60 KiB of data left behind by a previous tenant from /dev/vdc. Cloudflare has patched the issue, and security communities are discussing the implications of shared-storage isolation failures in multi-tenant cloud platforms.