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CVE-2009-1897

6.9 · MEDIUM

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 ga…

Published Jul 20, 2009linuxCWE-119EPSS 1.52%

Overview

CVE-2009-1897 is a medium-severity vulnerability affecting linux linux_kernel. It was published on July 20, 2009 and has a CVSS 2.0 base score of 6.9 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 6.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refarchives.neohapsis.com/archives/fulldisclosure/2009-07/0241.htmlRefarchives.neohapsis.com/archives/fulldisclosure/2009-07/0246.htmlRefarticle.gmane.org/gmane.linux.network/124939Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13Refgrsecurity.net/~spender/cheddar_bay.tgzRefisc.sans.org/diary.html?storyid=6820Reflkml.org/lkml/2009/7/6/19Refsecunia.com/advisories/35839Refwww.openwall.com/lists/oss-security/2009/07/17/1Refwww.vupen.com/english/advisories/2009/1925

How CyberStrike helps

Frequently asked questions

What is CVE-2009-1897?

CVE-2009-1897 is a medium-severity vulnerability affecting linux linux_kernel. It was published on July 20, 2009 and has a CVSS 2.0 base score of 6.9 (MEDIUM).

How severe is CVE-2009-1897?

This vulnerability has a CVSS 2.0 base score of 6.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-1897?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-1897?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-1897 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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