Vulnerability Details CVE-2016-9644
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 39.3%
CVSS Severity
CVSS v3 Score 7.8
CVSS v2 Score 9.3
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/
- 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/
Products affected by CVE-2016-9644
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cpe:2.3:o:linux:linux_kernel:4.4.22
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cpe:2.3:o:linux:linux_kernel:4.4.23
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cpe:2.3:o:linux:linux_kernel:4.4.24
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cpe:2.3:o:linux:linux_kernel:4.4.25
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cpe:2.3:o:linux:linux_kernel:4.4.26
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cpe:2.3:o:linux:linux_kernel:4.4.27
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cpe:2.3:o:linux:linux_kernel:4.4.28