CVE-2016-1576
CVE-2016-1576 is a high-severity vulnerability in Canonical Ubuntu Core with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 7.2
- EPSS exploit prediction: 1% (61st percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Canonical Ubuntu Core
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2016-1576?
- 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.
- How severe is CVE-2016-1576?
- CVE-2016-1576 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2016-1576 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2016-1576?
- CVE-2016-1576 primarily affects Canonical Ubuntu Core. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2016-1576?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2016-1576 published?
- CVE-2016-1576 was published on 2016-05-02 and last updated on 2026-06-17.
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360
- http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.html
- http://www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/
- http://www.openwall.com/lists/oss-security/2016/02/24/8
- http://www.openwall.com/lists/oss-security/2021/10/18/1
- https://bugs.launchpad.net/bugs/1535150
- https://launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patch
- https://launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patch
Affected products (8)
- cpe:2.3:o:canonical:ubuntu_core:15.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_touch:15.04:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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