CVE-2017-5669
HIGH severity · CVSS 7.8
7.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://bugzilla.kernel.org/show_bug.cgi?id=192931 ↗
Additional information
- NVD record
- https://bugzilla.kernel.org/show_bug.cgi?id=192931Patch
- https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01b8Patch
- https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7Patch
- http://www.debian.org/security/2017/dsa-3804Advisory
- http://www.securityfocus.com/bid/96754Advisory
- http://www.securitytracker.com/id/1037918Advisory
- https://usn.ubuntu.com/3583-1/Advisory
- https://usn.ubuntu.com/3583-2/Advisory