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    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.

    Published:Apr 9, 2009
    Last Modified:Apr 23, 2026
    EPS:Jul 20, 2009
    EPSS Score:0.01711
    CVSS Score:6.9

    Affected Products

    Vendor
    Linux
    Product
    Linux Kernel

    Exploits

    http://isc.sans.org/diary.html?storyid=6820http://lkml.org/lkml/2009/7/6/19http://isc.sans.org/diary.html?storyid=6820http://lkml.org/lkml/2009/7/6/19https://www.exploit-db.com/exploits/33088https://www.exploit-db.com/exploits/9191

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    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
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High