Fragnesia and friends: When page cache vulnerabilities keep coming back

A couple of weeks ago, I wrote about Copy-Fail (CVE-2026-31431) and how Red Hat OpenShift’s defense-in-depth approach prevented container escape despite a vulnerable kernel. I spent time actively trying to break out of an OpenShift container, achieved root inside the pod almost immediately, and still couldn’t escape to the host. The kernel vulnerability was real. The exploit path was real. The defenses still held. While I was wrapping up this article, another related variant, DirtyDecrypt (CVE-2026-31635), started circulating publicly alongside…

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