CVE-2016-9178

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-11-28 · updated 2026-06-17
Weakness: CWE-200

Description

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not initialize a certain integer variable, which allows local users to obtain sensitive information from kernel stack memory by triggering failure of a get_user_ex call.

Affected products

Linux kernel: through 4.7.4

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
http://www.openwall.com/lists/oss-security/2016/11/04/4
http://www.securityfocus.com/bid/94144
https://bugzilla.redhat.com/show_bug.cgi?id=1391908
https://github.com/torvalds/linux/commit/1c109fabbd51863475cd12ac206bdd249aee35af
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
http://www.openwall.com/lists/oss-security/2016/11/04/4
http://www.securityfocus.com/bid/94144
https://bugzilla.redhat.com/show_bug.cgi?id=1391908
https://github.com/torvalds/linux/commit/1c109fabbd51863475cd12ac206bdd249aee35af

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