What’s Vulnerable › Vulnerabilities

CVE-2017-5669

• Severity: high (CVSS 7.8 v3.1)
• 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: 2017-02-24 · updated 2026-06-17

Description

The do_shmat function in ipc/shm.c in the Linux kernel through 4.9.12 does not restrict the address calculated by a certain rounding operation, which allows local users to map page zero, and consequently bypass a protection mechanism that exists for the mmap system call, by making crafted shmget and shmat system calls in a privileged context.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04
• Debian Linux: 8.0
• Linux kernel: before 4.11 — fixed in 4.11

How to fix

Upgrade to a fixed version: Linux kernel 4.11. Check the vendor advisory for mitigations.

References

• http://www.debian.org/security/2017/dsa-3804
• http://www.securityfocus.com/bid/96754
• http://www.securitytracker.com/id/1037918
• https://bugzilla.kernel.org/show_bug.cgi?id=192931
• https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01b8
• https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7
• https://usn.ubuntu.com/3583-1/
• https://usn.ubuntu.com/3583-2/
• http://www.debian.org/security/2017/dsa-3804
• http://www.securityfocus.com/bid/96754
• http://www.securitytracker.com/id/1037918
• https://bugzilla.kernel.org/show_bug.cgi?id=192931

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