Public Date:
517830: CVE-2009-2695 kernel: SELinux and mmap_min_addr

The MITRE CVE dictionary describes this issue as:

The Linux kernel before 2.6.31-rc7 does not properly prevent mmap operations that target page zero and other low memory addresses, which allows local users to gain privileges by exploiting NULL pointer dereference vulnerabilities, related to (1) the default configuration of the allow_unconfined_mmap_low boolean in SELinux on Red Hat Enterprise Linux (RHEL) 5, (2) an error that causes allow_unconfined_mmap_low to be ignored in the unconfined_t domain, (3) lack of a requirement for the CAP_SYS_RAWIO capability for these mmap operations, and (4) interaction between the mmap_min_addr protection mechanism and certain application programs.

Find out more about CVE-2009-2695 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
Red Hat Enterprise Linux EUS (v. 5.3 server) (kernel) RHSA-2009:1587 2009-11-17
MRG Grid for RHEL 5 Server (kernel-rt) RHSA-2009:1540 2009-11-03
Red Hat Enterprise Linux EUS (v. 5.2 server) (kernel) RHSA-2009:1672 2009-12-15
Red Hat Enterprise Linux version 5 (kernel) RHSA-2009:1548 2009-11-03