The Unknown UniverseCopy Fail — CVE‑2026‑31431
Allows overwriting bytes in the shared page cache. A compromised Docker container or local process can now get full root on the host; disk integrity checks won’t see it.
**It’s patched — but not fixed — until you reboot.**
Distros are now shipping updated kernels.
Check kernel version:
uname -v
if older than Apr 22, 2026, you're likely still vulnerable
You must update the kernel package AND reboot the host. Restarting containers or services is not enough.
Treat this as critical if you self-host public services.
#Linux #InfoSec #CVE202631431 #CopyFail #SelfHosted #Docker #Kubernetes
Allows overwriting bytes in the shared page cache. A compromised Docker container or local process can now get full root on the host; disk integrity checks won’t see it.
**It’s patched — but not fixed — until you reboot.**
Distros are now shipping updated kernels.
Check kernel version:
uname -v
if older than Apr 22, 2026, you're likely still vulnerable
You must update the kernel package AND reboot the host. Restarting containers or services is not enough.
Treat this as critical if you self-host public services.
#Linux #InfoSec #CVE202631431 #CopyFail #SelfHosted #Docker #Kubernetes
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Liam @ GamingOnLinux 🐧🎮
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