CVE-2009-1897
CVE-2009-1897 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.
Key facts
- Severity: Medium (CVSS 2.0 base score 6.9)
- EPSS exploit prediction: 2% (71st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2009-1897?
- 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.
- How severe is CVE-2009-1897?
- CVE-2009-1897 has a CVSS 2.0 base score of 6.9, rated medium severity.
- Is CVE-2009-1897 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2009-1897?
- CVE-2009-1897 primarily affects Linux Linux Kernel. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2009-1897?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2009-1897 published?
- CVE-2009-1897 was published on 2009-07-20 and last updated on 2026-06-16.
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
Affected products (9)
- cpe:2.3:o:linux:linux_kernel:2.6.30:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc4:x86_32:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30:rc7-git6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.30.1:*:*:*:*:*:*:*
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