Security Update: CVE-2026-31431 ("Copy Fail")

CVE-2026-31431, a vulnerability named "Copy Fail," was disclosed on April 29, 2026, affecting the Linux kernel's authencesn AEAD cryptographic template. This flaw allows an unprivileged process to perform controlled writes into the kernel page cache via the AF_ALG socket interface, posing a risk for local privilege escalation. Daytona, which uses sandboxes on dedicated runner hosts, responded by updating its infrastructure to a newer kernel version, applying kernel patches, and blacklisting the algif_aead module to mitigate the risk. Within 12 hours of the vulnerability's disclosure, Daytona remediated all unpatched runners, ensuring the primitive became unreachable. An internal assessment showed that although the corruption primitive was accessible within a sandbox, it did not lead to a breach of the Sysbox runtime boundary or the host runner. No exploitation evidence was found, and precautionary measures included rotating runner credentials and pausing new signups during the remediation process. The vulnerability affected only transient kernel page cache and did not compromise persistent customer data.

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