Im Debian Kernel wurden 3 Sicherheitslücken gefunden. Diese sind in CVE-2023-0386, CVE-2023-31436 und CVE-2023-32233 beschrieben. Die Lücken wurden ab dem Kernel 5.10.179-1 in Debian Stable 11 Bullseye behoben.
Debian Kernel DSA 5402-1 Release Notes
CVE-2023-0386
It was discovered that under certain conditions the overlayfs filesystem implementation did not properly handle copy up operations. A local user permitted to mount overlay mounts in user namespaces can take advantage of this flaw for local privilege escalation.
CVE-2023-31436
Gwangun Jung reported a a flaw causing heap out-of-bounds read/write errors in the traffic control subsystem for the Quick Fair Queueing scheduler (QFQ) which may result in information leak, denial of service or privilege escalation.
CVE-2023-32233
Patryk Sondej and Piotr Krysiuk discovered a use-after-free flaw in the Netfilter nf_tables implementation when processing batch requests, which may result in local privilege escalation for a user with the CAP_NET_ADMIN capability in any user or network namespace.