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TI-2009-01806 Aliases CVE-2009-1895GHSA-rgcw-fh34-72mm

The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PER_CLEAR_ON_SETID…

Priority LOW 32CWE-16Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Complete · Complete · Complete
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.

Summary

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).

Why it matters now

EPSS 0.00439 38th percentileScored 2026-11-07
Fix Fixed Red Hat: 5 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*up to 2.6.31VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.31:rc1:*:*:*:*:*:*2.6.31 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.31:rc2:*:*:*:*:*:*2.6.31 rc2VulnerableLinux
cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:*4.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*5.0VulnerableDebian
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*6.06VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*8.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:*8.10VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:*9.04VulnerableCanonical
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions up to 2.6.31 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.31:rc1:*:*:*:*:*:* Versions 2.6.31 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.31:rc2:*:*:*:*:*:* Versions 2.6.31 rc2 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Debian
  • cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:* Versions 6.06 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:* Versions 8.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:* Versions 8.10 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:* Versions 9.04 Vulnerable ·Canonical

Remediation

Red Hat 5 advisories

  • RHSA-2010:0079 Released 2010-02-02 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux EUS (v. 5.2 server) kernel-2.6.18-92.1.35.el5, kernel-2.6.18-92.1.35.el5.ia64, kernel-PAE-2.6.18-92.1.35.el5 +14
  • RHSA-2009:1550 Released 2009-11-03 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Desktop version 3 kernel-2.4.21-63.EL, kernel-2.4.21-63.EL.athlon, kernel-2.4.21-63.EL.ia32e +14
    • Red Hat Enterprise Linux AS version 3 kernel-2.4.21-63.EL, kernel-2.4.21-63.EL.athlon, kernel-2.4.21-63.EL.ia32e +22
    • Red Hat Enterprise Linux ES version 3 kernel-2.4.21-63.EL, kernel-2.4.21-63.EL.athlon, kernel-2.4.21-63.EL.ia32e +18
    • Red Hat Enterprise Linux WS version 3 kernel-2.4.21-63.EL, kernel-2.4.21-63.EL.athlon, kernel-2.4.21-63.EL.ia32e +18
  • RHSA-2009:1540 Released 2009-11-03 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • MRG Realtime for RHEL 5 Server kernel-rt-2.6.24.7-137.el5rt, kernel-rt-debug-2.6.24.7-137.el5rt, kernel-rt-debug-devel-2.6.24.7-137.el5rt +6
Show 2 more Red Hat advisories
  • RHSA-2009:1438 Released 2009-09-15 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux AS version 4 kernel-2.6.9-89.0.11.EL, kernel-2.6.9-89.0.11.EL.ia64, kernel-2.6.9-89.0.11.EL.ppc64iseries +14
    • Red Hat Enterprise Linux Desktop version 4 kernel-2.6.9-89.0.11.EL, kernel-devel-2.6.9-89.0.11.EL, kernel-doc-2.6.9-89.0.11.EL +8
    • Red Hat Enterprise Linux ES version 4 kernel-2.6.9-89.0.11.EL, kernel-2.6.9-89.0.11.EL.ia64, kernel-devel-2.6.9-89.0.11.EL +12
    • Red Hat Enterprise Linux WS version 4 kernel-2.6.9-89.0.11.EL, kernel-2.6.9-89.0.11.EL.ia64, kernel-devel-2.6.9-89.0.11.EL +12
  • RHSA-2009:1193 Released 2009-08-04 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux (v. 5 server) kernel-2.6.18-128.4.1.el5, kernel-2.6.18-128.4.1.el5.ia64, kernel-PAE-2.6.18-128.4.1.el5 +18
    • Red Hat Enterprise Linux Desktop (v. 5 client) kernel-2.6.18-128.4.1.el5, kernel-PAE-2.6.18-128.4.1.el5, kernel-PAE-devel-2.6.18-128.4.1.el5 +8
    • Red Hat Enterprise Linux EUS (v. 5.3 server) kernel-2.6.18-128.4.1.el5, kernel-2.6.18-128.4.1.el5.ia64, kernel-PAE-2.6.18-128.4.1.el5 +18

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
MRG Realtime for RHEL 5 ServerFixed RHSA-2009:1540
Red Hat Desktop version 3Fixed RHSA-2009:1550
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2009:1193
Red Hat Enterprise Linux AS version 3Fixed RHSA-2009:1550
Red Hat Enterprise Linux AS version 4Fixed RHSA-2009:1438
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2009:1193
Red Hat Enterprise Linux Desktop version 4Fixed RHSA-2009:1438
Red Hat Enterprise Linux ES version 3Fixed RHSA-2009:1550
Red Hat Enterprise Linux ES version 4Fixed RHSA-2009:1438
Red Hat Enterprise Linux EUS (v. 5.2 server)Fixed RHSA-2010:0079
Red Hat Enterprise Linux EUS (v. 5.3 server)Fixed RHSA-2009:1193
Red Hat Enterprise Linux WS version 3Fixed RHSA-2009:1550
Red Hat Enterprise Linux WS version 4Fixed RHSA-2009:1438

Timeline

  1. 2026-10-02 Threatist record created from CVE-2009-1895
  2. 2026-10-03 Alias added: GHSA-rgcw-fh34-72mm

References

Patch 3

Advisory 18

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences