CVE-2004-2536: Linux Kernel

High severity, CVSS 7.5. EPSS: 2.3% chance of exploitation in the next 30 days.

The exit_thread function (process.c) in Linux kernel 2.6 through 2.6.5 does not invalidate the per-TSS io_bitmap pointers if a process obtains IO access permissions from the ioperm function but does not drop those permissions when it exits, which allows other processes to access the per-TSS pointers, access restricted memory locations, and possibly gain privileges.

Affected products

• Linux Linux Kernel: version 2.6.0 only; version 2.6.1 only; version 2.6.2 only; version 2.6.3 only; version 2.6.4 only; version 2.6.5 only

Published 2004-12-31. Last modified 2026-06-16.