kernel: deletion of a file or directory could unmount and reveal data under a mount point.
Published May 2, 2016
5.5
MEDIUMCVSS 3.0
EPSS 0.36%
Description
fs/namespace.c in the Linux kernel before 4.0.2 does not properly support mount connectivity, which allows local users to read arbitrary files by leveraging user-namespace root access for deletion of a file or directory.
Affected products
No data.
- ≤ 4.0.1
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AV:L/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2022-2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (9 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.36% (0.00355) | 26.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.36% (0.00355) | 27.20th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.10% (0.00102) | 25.65th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.95% (0.00950) | 30.63th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
References (8)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0c9c0afd2fc958ffa34b697972721d81df8a56f x_refsource_CONFIRMVendor Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2015/06/04/5 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2015-4176 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1249442 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/e0c9c0afd2fc958ffa34b697972721d81df8a56f x_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-4176
- https://www.cve.org/CVERecord?id=CVE-2015-4176
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0c9c0afd2fc958ffa34b697972721d81df8a56f | x_refsource_CONFIRMVendor Advisory | |
| http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2 | x_refsource_CONFIRM | |
| http://www.openwall.com/lists/oss-security/2015/06/04/5 | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2015-4176 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1249442 | x_refsource_CONFIRMIssue Tracking | |
| https://github.com/torvalds/linux/commit/e0c9c0afd2fc958ffa34b697972721d81df8a56f | x_refsource_CONFIRMVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-4176 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-4176 |
Change history (0)
No recorded changes yet.