CVE-2016-9644

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.

Category

7.8
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.17%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.ubuntu.com/usn/USN-3146-2 vendor advisory
http://www.securityfocus.com/bid/94545 vdb entry
http://www.ubuntu.com/usn/USN-3146-1 vendor advisory
http://www.openwall.com/lists/oss-security/2016/11/07/4 third party advisory mailing list
https://lwn.net/Articles/705220/ product

Frequently Asked Questions

What is the severity of CVE-2016-9644?
CVE-2016-9644 has been scored as a high severity vulnerability.
How to fix CVE-2016-9644?
To fix CVE-2016-9644, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-9644 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-9644 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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