CVE-2009-1897
The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2009-1897- CVSS 2.0
- 6.9 Medium
AV:L/AC:M/Au:N/C:C/I:C/A:C - Weakness
- CWE-119
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2009-1897- Updated
- 2026-11-02
EUVDEUVD-2009-1892 No score
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.
- Record
EUVD-2009-1892- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7g2j-wp9p-8rcr No score
The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30...
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.
- Record
GHSA-7g2j-wp9p-8rcr- Weakness
- CWE-119
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Linux Kernel 2.6.30 - 'tun_chr_pool()' Null Pointer Dereference | 2009-06-17 |
| Exploit-DB | Linux Kernel 2.6.30 < 2.6.30.1 / SELinux (RHEL 5) - Local Privilege Escalation | 2009-07-17 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-1897 is a medium vulnerability (CVSS 6.9) in Linux Kernel, published July 20, 2009. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.52%, the 74th percentile. No source names a fixed version.
References
vupen.com/english/advisories/2009/1925
isc.sans.org/diary.html?storyid=6820
grsecurity.net/~spender/cheddar_bay.tgz
openwall.com/lists/oss-security/2009/07/17/1
archives.neohapsis.com/archives/fulldisclosure/2009-07/0246.html
exchange.xforce.ibmcloud.com/vulnerabilities/51803
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article.gmane.org/gmane.linux.network/124939
secunia.com/advisories/35839
git.kernel.org?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13
bugzilla.redhat.com/show_bug.cgi?id=512284
lkml.org/lkml/2009/7/6/19
redhat.com/en/blog/security-flaws-caused-compiler-optimizations
nvd.nist.gov/vuln/detail/CVE-2009-1897
github.com/advisories/GHSA-7g2j-wp9p-8rcr