CVE-2009-1895

N/A Unknown
Published: July 16, 2009 Modified: April 23, 2026
View on NVD

Description

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).

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.html
Source: secalert@redhat.com
Patch Third Party Advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
Source: secalert@redhat.com
http://patchwork.kernel.org/patch/32598/
Source: secalert@redhat.com
Patch Vendor Advisory
http://secunia.com/advisories/35801
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/36045
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/36051
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/36054
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/36116
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/36131
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/36759
Source: secalert@redhat.com
Third Party Advisory
http://secunia.com/advisories/37471
Source: secalert@redhat.com
Third Party Advisory
http://wiki.rpath.com/Advisories:rPSA-2009-0111
Source: secalert@redhat.com
Third Party Advisory
http://www.debian.org/security/2009/dsa-1844
Source: secalert@redhat.com
Third Party Advisory
http://www.debian.org/security/2009/dsa-1845
Source: secalert@redhat.com
Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3
Source: secalert@redhat.com
Vendor Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
Source: secalert@redhat.com
Third Party Advisory
http://www.osvdb.org/55807
Source: secalert@redhat.com
Broken Link
http://www.redhat.com/support/errata/RHSA-2009-1193.html
Source: secalert@redhat.com
Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2009-1438.html
Source: secalert@redhat.com
Third Party Advisory
http://www.securityfocus.com/archive/1/505254/100/0/threaded
Source: secalert@redhat.com
Third Party Advisory VDB Entry
http://www.securityfocus.com/archive/1/507985/100/0/threaded
Source: secalert@redhat.com
Third Party Advisory VDB Entry
http://www.securityfocus.com/archive/1/512019/100/0/threaded
Source: secalert@redhat.com
Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/35647
Source: secalert@redhat.com
Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/usn-807-1
Source: secalert@redhat.com
Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2009-0016.html
Source: secalert@redhat.com
Third Party Advisory
http://www.vupen.com/english/advisories/2009/1866
Source: secalert@redhat.com
Patch Third Party Advisory
http://www.vupen.com/english/advisories/2009/3316
Source: secalert@redhat.com
Third Party Advisory
https://bugs.launchpad.net/bugs/cve/2009-1895
Source: secalert@redhat.com
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768
Source: secalert@redhat.com
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826
Source: secalert@redhat.com
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453
Source: secalert@redhat.com
Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1540.html
Source: secalert@redhat.com
Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1550.html
Source: secalert@redhat.com
Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html
Source: secalert@redhat.com
Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html
Source: secalert@redhat.com
Third Party Advisory
http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.html
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
Source: af854a3a-2127-422b-91ae-364da2661108
http://patchwork.kernel.org/patch/32598/
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
http://secunia.com/advisories/35801
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/36045
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/36051
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/36054
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/36116
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/36131
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/36759
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://secunia.com/advisories/37471
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://wiki.rpath.com/Advisories:rPSA-2009-0111
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.debian.org/security/2009/dsa-1844
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.debian.org/security/2009/dsa-1845
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.osvdb.org/55807
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link
http://www.redhat.com/support/errata/RHSA-2009-1193.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2009-1438.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.securityfocus.com/archive/1/505254/100/0/threaded
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
http://www.securityfocus.com/archive/1/507985/100/0/threaded
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
http://www.securityfocus.com/archive/1/512019/100/0/threaded
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/35647
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/usn-807-1
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2009-0016.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.vupen.com/english/advisories/2009/1866
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
http://www.vupen.com/english/advisories/2009/3316
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://bugs.launchpad.net/bugs/cve/2009-1895
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1540.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1550.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

70 reference(s) from NVD

Quick Stats

CVSS v3 Score
N/A / 10.0
EPSS (Exploit Probability)
0.1%
19th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-16

Affected Vendors

canonical linux debian

Related CVEs

CVE-2026-6786 8.1
CVE-2026-6785 8.1
CVE-2026-7041 3.7
CVE-2026-7039 7.8
CVE-2026-7038 3.3