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.

References

http://www.openwall.com/lists/oss-security/2016/11/07/4

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/

Details

Risk Information

CVSS v2

CVSS v3