Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.11 |
| Debian | Debian Linux | 8.0 |
| Canonical | Ubuntu Linux | 12.04 |
References
- http://www.debian.org/security/2017/dsa-3804Third Party Advisory
- http://www.securityfocus.com/bid/96754Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037918Third Party AdvisoryVDB Entry
- https://bugzilla.kernel.org/show_bug.cgi?id=192931Issue TrackingPatchVendor Advisory
- https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01bPatchThird Party Advisory
- https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0cPatchThird Party Advisory
- https://usn.ubuntu.com/3583-1/Third Party Advisory
- https://usn.ubuntu.com/3583-2/Third Party Advisory
- http://www.debian.org/security/2017/dsa-3804Third Party Advisory
- http://www.securityfocus.com/bid/96754Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037918Third Party AdvisoryVDB Entry
- https://bugzilla.kernel.org/show_bug.cgi?id=192931Issue TrackingPatchVendor Advisory
- https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01bPatchThird Party Advisory
- https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0cPatchThird Party Advisory
- https://usn.ubuntu.com/3583-1/Third Party Advisory
FAQ
What is CVE-2017-5669?
CVE-2017-5669 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 consequen...
How severe is CVE-2017-5669?
CVE-2017-5669 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-5669?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux, Canonical Ubuntu Linux.