CVE-2009-1895

Name: CVE-2009-1895
Creator: NVD / NIST
Published: 2009-07-16T15:30:00.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.44%

Last modified Jun 16, 2026

CVE-2009-1895 is a vulnerability of currently unknown severity. 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).. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

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).

Metrics

EPSS Probability

0.44%

35.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-16

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	<= 2.6.31	—
Linux	Linux Kernel	2.6.31	Rc1
Debian	Debian Linux	4.0	—
Debian	Debian Linux	5.0	—
Canonical	Ubuntu Linux	6.06	—
Canonical	Ubuntu Linux	8.04	—
Canonical	Ubuntu Linux	8.10	—
Canonical	Ubuntu Linux	9.04	—

References

http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.htmlPatch, Third Party Advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
http://patchwork.kernel.org/patch/32598/Patch, Vendor Advisory
http://secunia.com/advisories/35801Third Party Advisory
http://secunia.com/advisories/36045Third Party Advisory
http://secunia.com/advisories/36051Third Party Advisory
http://secunia.com/advisories/36054Third Party Advisory
http://secunia.com/advisories/36116Third Party Advisory
http://secunia.com/advisories/36131Third Party Advisory
http://secunia.com/advisories/36759Third Party Advisory
http://secunia.com/advisories/37471Third Party Advisory
http://wiki.rpath.com/Advisories:rPSA-2009-0111Third Party Advisory
http://www.debian.org/security/2009/dsa-1844Third Party Advisory
http://www.debian.org/security/2009/dsa-1845Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3Vendor Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051Third Party Advisory
http://www.osvdb.org/55807Broken Link
http://www.redhat.com/support/errata/RHSA-2009-1193.htmlThird Party Advisory
http://www.redhat.com/support/errata/RHSA-2009-1438.htmlThird Party Advisory
http://www.securityfocus.com/archive/1/505254/100/0/threadedThird Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/507985/100/0/threadedThird Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/512019/100/0/threadedThird Party Advisory, VDB Entry
http://www.securityfocus.com/bid/35647Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/usn-807-1Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2009-0016.htmlThird Party Advisory
http://www.vupen.com/english/advisories/2009/1866Patch, Third Party Advisory
http://www.vupen.com/english/advisories/2009/3316Third Party Advisory
https://bugs.launchpad.net/bugs/cve/2009-1895Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1540.htmlThird Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1550.htmlThird Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.htmlThird Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.htmlThird Party Advisory
http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.htmlPatch, Third Party Advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
http://patchwork.kernel.org/patch/32598/Patch, Vendor Advisory
http://secunia.com/advisories/35801Third Party Advisory
http://secunia.com/advisories/36045Third Party Advisory
http://secunia.com/advisories/36051Third Party Advisory
http://secunia.com/advisories/36054Third Party Advisory
http://secunia.com/advisories/36116Third Party Advisory
http://secunia.com/advisories/36131Third Party Advisory
http://secunia.com/advisories/36759Third Party Advisory
http://secunia.com/advisories/37471Third Party Advisory
http://wiki.rpath.com/Advisories:rPSA-2009-0111Third Party Advisory
http://www.debian.org/security/2009/dsa-1844Third Party Advisory
http://www.debian.org/security/2009/dsa-1845Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3Vendor Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051Third Party Advisory
http://www.osvdb.org/55807Broken Link
http://www.redhat.com/support/errata/RHSA-2009-1193.htmlThird Party Advisory
http://www.redhat.com/support/errata/RHSA-2009-1438.htmlThird Party Advisory
http://www.securityfocus.com/archive/1/505254/100/0/threadedThird Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/507985/100/0/threadedThird Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/512019/100/0/threadedThird Party Advisory, VDB Entry
http://www.securityfocus.com/bid/35647Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/usn-807-1Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2009-0016.htmlThird Party Advisory
http://www.vupen.com/english/advisories/2009/1866Patch, Third Party Advisory
http://www.vupen.com/english/advisories/2009/3316Third Party Advisory
https://bugs.launchpad.net/bugs/cve/2009-1895Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1540.htmlThird Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1550.htmlThird Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.htmlThird Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.htmlThird Party Advisory

Timeline

Published: Jul 16, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-1895?

How severe is CVE-2009-1895?

Severity scoring for CVE-2009-1895 is pending analysis. The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2009-1895?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-1895?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST