CVE-2017-5669
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 4.9.13-1 |
| debian | bullseye | fixed | 4.9.13-1 |
| debian | forky | fixed | 4.9.13-1 |
| debian | sid | fixed | 4.9.13-1 |
| debian | trixie | fixed | 4.9.13-1 |
| linux-kernel | affected | 4.11 | |
| debian | 8.0 | affected | |
| ubuntu | 12.04 | affected | |
| ubuntu | 14.04 | affected | |
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/
- https://www.suse.com/security/cve/CVE-2017-5669.html
- https://security-tracker.debian.org/tracker/CVE-2017-5669
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.