Improper input validation in Linux kernel - CVE-2006-5173
Published: October 18, 2006 / Updated: August 19, 2020
Vulnerability identifier: #VU99779
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2006-5173
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform service disruption.
Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.
How to mitigate CVE-2006-5173
Install update from vendor's repository.
Sources
- http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47a5c6fa0e204a2b63309c648bb2fde36836c826
- http://secunia.com/advisories/23361
- http://secunia.com/advisories/23384
- http://secunia.com/advisories/23474
- http://secunia.com/advisories/23593
- http://secunia.com/advisories/25691
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:002
- http://www.novell.com/linux/security/advisories/2006_79_kernel.html
- http://www.securityfocus.com/archive/1/471457
- http://www.securityfocus.com/bid/21851
- http://www.ubuntu.com/usn/usn-395-1