CVE-2016-1576: canonical ubuntu_core
Vulnerability summary
CVE-2016-1576 is a high (CVSS 7.8) vulnerability in canonical ubuntu_core. EPSS estimates a 1.13% chance of exploitation in the next 30 days, higher than 65.8% of scored vulnerabilities. 2 public exploits are recorded.
Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 02-05-2016PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.13%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
0.00 pp
From 1.13% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (halfdog.net)
Maturity: unknown
Ubuntu 15.10 - 'USERNS ' Overlayfs Over Fuse Privilege Escalation
Maturity: poc
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu4 products
- linux< 3.13.0-79.123
- linux-lts-utopic< 3.16.0-62.82~14.04.1
- linux-lts-vivid< 3.19.0-51.57~14.04.1
- linux-lts-wily< 4.2.0-30.35~14.04.1
Canonical3 products
- ubuntu_core15.04
- ubuntu_linuxEOL12.04 | 14.04 | 15.10 | 16.04 | 16.10
- ubuntu_touch15.04
Debian1 product
- linux< 4.5.1-1
Linux1 product
- linux_kernel≤ 4.5.2
4 vendors · 9 products
References
20 links- launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patchX Refsource MISCMailing ListPatchThird Party Advisory
- launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patchX Refsource MISCMailing ListPatchThird Party Advisory
- people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.htmlX Refsource CONFIRMThird Party Advisory
- www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/X Refsource MISCExploitThird Party AdvisoryREPORT
