Public Date:
511171: CVE-2009-1895 kernel: personality: fix PER_CLEAR_ON_SETID

The MITRE CVE dictionary describes this issue as:

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).

Find out more about CVE-2009-1895 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 2.1
Base Metrics AV:L/AC:L/Au:N/C:N/I:P/A:N
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
MRG Grid for RHEL 5 Server (kernel-rt) RHSA-2009:1540 2009-11-03
Red Hat Enterprise Linux EUS (v. 5.3 server) (kernel) RHSA-2009:1193 2009-08-04
Red Hat Enterprise Linux version 3 (kernel) RHSA-2009:1550 2009-11-03
Red Hat Enterprise Linux version 4 (kernel) RHSA-2009:1438 2009-09-15
Red Hat Enterprise Linux EUS (v. 5.2 server) (kernel) RHSA-2010:0079 2010-02-02
Red Hat Enterprise Linux version 5 (kernel) RHSA-2009:1193 2009-08-04