{
    "id": "CVE-2009-1897",
    "published": "2009-07-20 17:30:54",
    "last_modified": "2026-06-16 23:08:18",
    "cvss_score": "6.9",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
    "cwe": "CWE-119",
    "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.",
    "epss_score": "0.01521",
    "epss_percentile": "0.73851",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-09 18:17:09",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "linux",
            "product": "linux_kernel"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "9191",
            "title": "Linux Kernel 2.6.30 < 2.6.30.1 / SELinux (RHEL 5) - Local Privilege Escalation",
            "date": "2009-07-17",
            "url": "https://www.exploit-db.com/exploits/9191"
        },
        {
            "source": "exploit-db",
            "ref_id": "33088",
            "title": "Linux Kernel 2.6.30 - 'tun_chr_pool()' Null Pointer Dereference",
            "date": "2009-06-17",
            "url": "https://www.exploit-db.com/exploits/33088"
        }
    ],
    "refs_list": [
        "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"
    ]
}