Improper privilege management in Linux kernel - CVE-2009-2848

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Main Vulnerability Database Vulnerabilities #VU92839

Improper privilege management in Linux kernel - CVE-2009-2848

Published: August 19, 2009 / Updated: August 28, 2020


Vulnerability identifier: #VU92839
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2009-2848
CWE-ID: CWE-269
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to read and manipulate data.

The execve function in the Linux kernel, possibly 2.6.30-rc6 and earlier, does not properly clear the current->clear_child_tid pointer, which allows local users to cause a denial of service (memory corruption) or possibly gain privileges via a clone system call with CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID enabled, which is not properly handled during thread creation and exit.


Affected software

Linux kernel
Ubuntu
linux-source-2.6.15 (Ubuntu package)
linux (Ubuntu package)

How to mitigate CVE-2009-2848

Install update from vendor's repository.

linux-source-2.6.15 (Ubuntu package) - update to 2.6.15-55.80
linux (Ubuntu package) - addressed in versions 2.6.24-25.63, 2.6.27-15.43, 2.6.28-16.55

External References

Related Security Bulletins