CVE-2019-13233: In arch/x86/lib/insn-eval.c in the Linux kernel before 5.1.9, there is a use-after-free for access to an LD...

Security readout for executives and security teams

This is a Linux kernel memory-safety flaw in x86 handling around LDT entries. A race between modify_ldt() and an MPX bounds exception could make the kernel use memory after it was freed. The sources show broad Linux distribution advisories and a fix before Linux 5.1.9, but no CISA KEV listing or sourced active exploitation. Exposure is most likely on x86 Linux systems running kernels before 5.1.9 or vendor kernels without the backported fix. Debian, Ubuntu, openSUSE, Red Hat, NetApp, and F5 references indicate downstream impact review or patched advisories. Treat as a kernel patching priority for Linux fleets, especially multi-user or shared compute environments. Lack of KEV evidence lowers emergency pressure, but kernel use-after-free flaws can have serious operational impact if exploitable. Mitigation focus: Update affected Linux kernels using vendor security advisories.; For mainline kernels, move to Linux 5.1.9 or later.; Confirm Debian, Ubuntu, Red Hat, and openSUSE patch levels where applicable..

Prepared

Jun 6, 2026, 20:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.