Vulnerability Description
The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | 4.4.22 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2016/11/07/4Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/94545
- http://www.ubuntu.com/usn/USN-3146-1
- http://www.ubuntu.com/usn/USN-3146-2
- https://lwn.net/Articles/705220/Product
- http://www.openwall.com/lists/oss-security/2016/11/07/4Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/94545
- http://www.ubuntu.com/usn/USN-3146-1
- http://www.ubuntu.com/usn/USN-3146-2
- https://lwn.net/Articles/705220/Product
FAQ
What is CVE-2016-9644?
CVE-2016-9644 is a vulnerability with a CVSS score of 7.8 (HIGH). The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows lo...
How severe is CVE-2016-9644?
CVE-2016-9644 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-9644?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.