Incompatible Extended ASM Statements Vulnerability in Linux Kernel 4.4.22-4.4.28

CVE-2016-9644 · HIGH Severity

AV:N/AC:M/AU:N/C:C/I:C/A:C

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.

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