CVE-2023-2640

Name of the Vulnerable Software and Affected Versions Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs"

Description The issue is related to the overlayfs file system in Ubuntu kernels, where an unprivileged user may set privileged extended attributes on mounted files without proper security checks, potentially leading to arbitrary code execution or denial of service. This is due to a missing authorization check in the overlayfs file system.

Recommendations As a temporary workaround, consider disabling the overlayfs file system until a patch is available. Restrict access to the mounted files to minimize the risk of exploitation. Avoid using privileged extended attributes on the mounted files until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.