CVE-2016-1575: canonical ubuntu_core Improper Privilege Management
Vulnerability summary
CVE-2016-1575 is a high (CVSS 7.8) Improper Privilege Management vulnerability in canonical ubuntu_core. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.6% 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 maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.
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
0.92%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
0.00 pp
From 0.92% 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 14.04/15.10 - User Namespace Overlayfs Xattr SetGID Privilege Escalation
Maturity: poc
Weaknesses
CWE · root causeAffected 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
17 links- people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1575.htmlX Refsource CONFIRMThird Party Advisory
- www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/X Refsource MISCExploitThird Party AdvisoryREPORT
