Ensure /dev/shm is tmpfs or a separate partition

How it is checked

Audit method: Shell command

if findmnt -kn /dev/shm >/dev/null 2>&1; then echo compliant; else echo /dev/shm' is not a separate partition'; fi

Expected output

compliant

How it is fixed

Fix method: Guidance or infrastructure patch

For specific configuration requirements of the /dev/shm mount for your environment, modify /etc/fstab. Example: tmpfs /dev/shm tmpfs defaults,rw,nosuid,nodev,noexec,relatime,size=2G 0 0 Note: Using Btrfs subvolumes instead of traditional disk partitions changes how disk space is allocated and enforced, quotas may need to be configured to enforce storage limits and prevent resource exhaustion.

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

tmaegis scan --target linux