CVE-2009-1897 EXPLOIT
6.9
MEDIUM · CVSS 2.0 · EPSS 1.5% (pctl 74)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.9 (MEDIUM, v2.0) |
|---|---|
| Vector | AV:L/AC:M/Au:N/C:C/I:C/A:C |
| EPSS | 1.52% — more likely to be exploited than 74% of all CVEs |
| Weakness | CWE-119 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2009-07-20 |
| Last modified | 2026-06-16 |
Affected (1)
| Vendor | Product |
|---|---|
| linux | linux kernel |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Linux Kernel 2.6.30 < 2.6.30.1 / SELinux (RHEL 5) - Local Privilege Escalation | 2009-07-17 |
| exploit-db | Linux Kernel 2.6.30 - 'tun_chr_pool()' Null Pointer Dereference | 2009-06-17 |
References
- http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0241.html
- http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0246.html
- http://article.gmane.org/gmane.linux.network/124939
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13
- http://grsecurity.net/~spender/cheddar_bay.tgz
- http://isc.sans.org/diary.html?storyid=6820
- http://lkml.org/lkml/2009/7/6/19
- http://secunia.com/advisories/35839
- http://www.openwall.com/lists/oss-security/2009/07/17/1
- http://www.vupen.com/english/advisories/2009/1925
- https://bugzilla.redhat.com/show_bug.cgi?id=512284
- https://exchange.xforce.ibmcloud.com/vulnerabilities/51803
- https://www.redhat.com/en/blog/security-flaws-caused-compiler-optimizations
- http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0241.html
- http://archives.neohapsis.com/archives/fulldisclosure/2009-07/0246.html
- http://article.gmane.org/gmane.linux.network/124939
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13
- http://grsecurity.net/~spender/cheddar_bay.tgz
- http://isc.sans.org/diary.html?storyid=6820
- http://lkml.org/lkml/2009/7/6/19
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