kernel: vfs: ioctl: double fetch leading to heap overflow
Published Aug 6, 2016
8.4
HIGHCVSS 3.0
EPSS 0.95%
Description
Race condition in the ioctl_file_dedupe_range function in fs/ioctl.c in the Linux kernel through 4.7 allows local users to cause a denial of service (heap-based buffer overflow) or possibly gain privileges by changing a certain count value, aka a "double fetch" vulnerability.
Affected products
No data.
- ≤ 4.7
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
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:M/Au:N/C:P/I:P/A:P
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 1, 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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.95% (0.00949) | 59.80th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.95% (0.00949) | 56.43th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.52% (0.00516) | 64.68th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00089) | 39.99th | v3 (v2023.03.01) |
| Jun 15, 2024 | 0.07% (0.00071) | 30.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00071) | 28.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.79% (0.01787) | 76.91th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.79% (0.01787) | 76.86th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.79% (0.01787) | 74.83th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.79% (0.01787) | 54.18th | v2 (v2022.01.01) |
References (8)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=10eec60ce79187686e052092e5383c99b4420a20 x_refsource_CONFIRMPatch
- http://www.openwall.com/lists/oss-security/2016/07/31/6 mailing-listx_refsource_MLISTRelease Notes
- http://www.securityfocus.com/bid/92259 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2016-6516 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1362457 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- https://github.com/torvalds/linux/commit/10eec60ce79187686e052092e5383c99b4420a20 x_refsource_CONFIRMPatch
- https://nvd.nist.gov/vuln/detail/CVE-2016-6516
- https://www.cve.org/CVERecord?id=CVE-2016-6516
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=10eec60ce79187686e052092e5383c99b4420a20 | x_refsource_CONFIRMPatch | |
| http://www.openwall.com/lists/oss-security/2016/07/31/6 | mailing-listx_refsource_MLISTRelease Notes | |
| http://www.securityfocus.com/bid/92259 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2016-6516 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1362457 | x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry | |
| https://github.com/torvalds/linux/commit/10eec60ce79187686e052092e5383c99b4420a20 | x_refsource_CONFIRMPatch | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-6516 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-6516 |
Change history (0)
No recorded changes yet.