Public Date:
515392: CVE-2009-2847 kernel: information leak in sigaltstack

The MITRE CVE dictionary describes this issue as:

The do_sigaltstack function in kernel/signal.c in Linux kernel 2.4 through 2.4.37 and 2.6 before 2.6.31-rc5, when running on 64-bit systems, does not clear certain padding bytes from a structure, which allows local users to obtain sensitive information from the kernel stack via the sigaltstack function.

Find out more about CVE-2009-2847 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue has been rated as having moderate security impact. It was addressed in Red Hat Enterprise Linux 4, 5 and Red Hat Enterprise MRG:

This issue is not planned to be fixed in Red Hat Enterprise Linux 3, due to this product being in Production 3 of its maintenance life-cycle, where only qualified security errata of important or critical impact are addressed. For further information about Errata Support Policy, visit:

CVSS v2 metrics

Base Score 2.1
Base Metrics AV:L/AC:L/Au:N/C:P/I:N/A:N
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
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-2009:1466 2009-09-29
Red Hat Enterprise Linux 4 (kernel) RHSA-2009:1438 2009-09-15
Red Hat Enterprise Linux 5 (kernel) RHSA-2009:1243 2009-09-02
MRG Grid for RHEL 5 Server (kernel-rt) RHSA-2009:1239 2009-09-01
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