Description
fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of mounts.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.8.11-1 | — |
| Debian 13 | linux | 4.8.11-1 | — |
| Debian 12 | linux | 4.8.11-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-riscv +6 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +4 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-57.78 | USN-3161-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1038.45 | USN-3161-3 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1042.46 | USN-3161-4 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-106.153 | USN-3160-1 |
| Ubuntu 14.04 LTS | linux-lts-vivid | 3.19.0-78.86~14.04.1 | — |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-57.78~14.04.1 | USN-3161-2 |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-693.rt56.617.el7 | RHSA-2017:2077 |
| RHEL 7 | perf +17 | 3.10.0-693.el7 | RHSA-2017:1842 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-4.1.12-94.5.9.el6uek | 0.6.0-4.el6 | ELSA-2017-3605 |
| Oracle Linux 7 | dtrace-modules-4.1.12-94.5.9.el7uek | 0.6.0-4.el7 | ELSA-2017-3605 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-94.5.9.el7uek | ELSA-2017-3605 |
| Oracle Linux 7 | perf +11 | 3.10.0-693.el7 | ELSA-2017-1842 |
Advisories 9
- RHSA-2017:2077 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:1842 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3160-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3161-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3161-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3161-3 linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3161-4 linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- ELSA-2017-3605 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 17, 2017
- ELSA-2017-1842 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 7, 2017
References
- [oss-security] 20160713 Re: cve request: local DoS by overflowing kernel mount table using shared bind mount mailing-list
- https://github.com/torvalds/linux/commit/d29216842a85c7970c536108e093963f02714498
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d29216842a85c7970c536108e093963f02714498
- 91754 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1356471
- RHSA-2017:2077 vendor-advisory
- RHSA-2017:1842 vendor-advisory