Privilege Escalation via Unvalidated Per-TSS IO Bitmap Pointers

CVE-2004-2536 · HIGH Severity

AV:N/AC:L/AU:N/C:P/I:P/A:P

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.

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