CVE-2017-5669
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.40% probability · 34th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel · debian/debian linux · canonical/ubuntu linux
- Source
- cve@mitre.org
References
- http://www.debian.org/security/2017/dsa-3804Third Party Advisory
- http://www.securityfocus.com/bid/96754Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037918Third Party Advisory, VDB Entry
- https://bugzilla.kernel.org/show_bug.cgi?id=192931Issue Tracking, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01b8Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7Patch, Third 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 Advisory, VDB Entry
- http://www.securitytracker.com/id/1037918Third Party Advisory, VDB Entry
- https://bugzilla.kernel.org/show_bug.cgi?id=192931Issue Tracking, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01b8Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7Patch, Third Party Advisory
- https://usn.ubuntu.com/3583-1/Third Party Advisory
- https://usn.ubuntu.com/3583-2/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.