What is CVE-2009-1897?

CVE-2009-1897 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.9 out of 10, classified as a Buffer Overflow flaw (CWE-119). CVE-2009-1897 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2009-1897?

CVE-2009-1897 has a CVSS score of 6.9 out of 10, rated Medium severity. The vector string is AV:L/AC:M/Au:N/C:C/I:C/A:C.

Is there a patch available for CVE-2009-1897?

No patch is currently available for CVE-2009-1897. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2009-1897 actively exploited?

CVE-2009-1897 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Buffer Overflow (CWE-119)?

The product performs operations on a memory buffer but reads or writes outside its intended boundaries. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/119.html

CVE-2009-1897

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 gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun, a different vulnerability than CVE-2009-1894.

Package Linux Kernel

Published 2009-07-20

Last modified 2026-04-23

CVSS version 2.0

Patch available

Awaiting data

CVSS 2.0 score

6.9

out of 10

Medium

Attack Vector

Local

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Vector string

AV:L/AC:M/Au:N/C:C/I:C/A:C

Weakness type

CWE-119

CVE-2009-1897 is a Buffer Overflow vulnerability

What is Buffer Overflow?

The product performs operations on a memory buffer but reads or writes outside its intended boundaries. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2009-1897 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Archives
http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0241.html
Archives
http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0246.html
Article
http://article.gmane.org/gmane.linux.network/124939
Isc
http://isc.sans.org/diary.html?storyid=6820

Exploit
Lkml
http://lkml.org/lkml/2009/7/6/19

Exploit
Secunia
http://secunia.com/advisories/35839

Vendor Advisory
Openwall
http://www.openwall.com/lists/oss-security/2009/07/17/1
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=512284
Exchange
https://exchange.xforce.ibmcloud.com/vulnerabilities/51803
Red Hat
https://www.redhat.com/en/blog/security-flaws-caused-compiler-optimizations
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13
Patch
Kernel patch commit
http://grsecurity.net/~spender/cheddar_bay.tgz
Patch
Kernel patch commit
http://www.vupen.com/english/advisories/2009/1925
Patch

Details

CVE ID CVE-2009-1897

Severity Medium

CVSS score 6.9 / 10

CVSS version 2.0

Published 2009-07-20

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2009-1897?

CVE-2009-1897 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.9 out of 10 , classified as a Buffer Overflow flaw (CWE-119) . CVE-2009-1897 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2009-1897?

CVE-2009-1897 has a CVSS score of 6.9 out of 10, rated Medium severity (CVSS 2.0). The vector string is AV:L/AC:M/Au:N/C:C/I:C/A:C.
Is there a patch available for CVE-2009-1897?

No patch is currently available for CVE-2009-1897. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2009-1897 actively exploited?

No — CVE-2009-1897 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Buffer Overflow (CWE-119)?

The product performs operations on a memory buffer but reads or writes outside its intended boundaries. View CWE-119 on MITRE CWE →