CVE-2023-3773: Debian Linux

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.

Affected products

• Debian Debian Linux: version 10.0 only; version 12.0 only
• Fedoraproject Fedora: affected versions not specified
• Linux Linux Kernel: affected versions not specified
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2023-07-25. Last modified 2026-06-17.