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    CVE-2009-1895

    The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PER_CLEAR_ON_SETID setting that does not clear the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags when executing a setuid or setgid program, which makes it easier for local users to leverage the details of memory usage to (1) conduct NULL pointer dereference attacks, (2) bypass the mmap_min_addr protection mechanism, or (3) defeat address space layout randomization (ASLR).

    Published:Jun 26, 2009
    Last Modified:Apr 23, 2026
    EPS:Jul 16, 2009
    EPSS Score:0.0006
    CVSS Score:7.2

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Mrg
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.html
    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
    http://patchwork.kernel.org/patch/32598/
    http://secunia.com/advisories/35801
    http://secunia.com/advisories/36045
    http://secunia.com/advisories/36051
    http://secunia.com/advisories/36054
    http://secunia.com/advisories/36116
    http://secunia.com/advisories/36131
    http://secunia.com/advisories/36759
    http://secunia.com/advisories/37471
    http://wiki.rpath.com/Advisories:rPSA-2009-0111
    http://www.debian.org/security/2009/dsa-1844
    http://www.debian.org/security/2009/dsa-1845
    http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
    http://www.osvdb.org/55807
    http://www.redhat.com/support/errata/RHSA-2009-1193.html
    http://www.redhat.com/support/errata/RHSA-2009-1438.html
    http://www.securityfocus.com/archive/1/505254/100/0/threaded
    http://www.securityfocus.com/archive/1/507985/100/0/threaded
    http://www.securityfocus.com/archive/1/512019/100/0/threaded
    http://www.securityfocus.com/bid/35647
    http://www.ubuntu.com/usn/usn-807-1
    http://www.vmware.com/security/advisories/VMSA-2009-0016.html
    http://www.vupen.com/english/advisories/2009/1866
    http://www.vupen.com/english/advisories/2009/3316
    https://bugs.launchpad.net/bugs/cve/2009-1895
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453
    https://rhn.redhat.com/errata/RHSA-2009-1540.html
    https://rhn.redhat.com/errata/RHSA-2009-1550.html
    https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html
    https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html
    http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.html
    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
    http://patchwork.kernel.org/patch/32598/
    http://secunia.com/advisories/35801
    http://secunia.com/advisories/36045
    http://secunia.com/advisories/36051
    http://secunia.com/advisories/36054
    http://secunia.com/advisories/36116
    http://secunia.com/advisories/36131
    http://secunia.com/advisories/36759
    http://secunia.com/advisories/37471
    http://wiki.rpath.com/Advisories:rPSA-2009-0111
    http://www.debian.org/security/2009/dsa-1844
    http://www.debian.org/security/2009/dsa-1845
    http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
    http://www.osvdb.org/55807
    http://www.redhat.com/support/errata/RHSA-2009-1193.html
    http://www.redhat.com/support/errata/RHSA-2009-1438.html
    http://www.securityfocus.com/archive/1/505254/100/0/threaded
    http://www.securityfocus.com/archive/1/507985/100/0/threaded
    http://www.securityfocus.com/archive/1/512019/100/0/threaded
    http://www.securityfocus.com/bid/35647
    http://www.ubuntu.com/usn/usn-807-1
    http://www.vmware.com/security/advisories/VMSA-2009-0016.html
    http://www.vupen.com/english/advisories/2009/1866
    http://www.vupen.com/english/advisories/2009/3316
    https://bugs.launchpad.net/bugs/cve/2009-1895
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453
    https://rhn.redhat.com/errata/RHSA-2009-1540.html
    https://rhn.redhat.com/errata/RHSA-2009-1550.html
    https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html
    https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html

    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