CVE-2009-1897: Linux Kernel

Medium severity, CVSS 6.9. EPSS: 1.5% chance of exploitation in the next 30 days.

The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30 and 2.6.30.1, when the -fno-delete-null-pointer-checks gcc option is omitted, allows local users to gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun, a different vulnerability than CVE-2009-1894.

Affected products

• Linux Linux Kernel: version 2.6.30 only; version 2.6.30.1 only

Published 2009-07-20. Last modified 2026-06-16.