kernel: bpf: refcnt overflow
Published May 23, 2016
7.0
HIGHCVSS 3.1
EPSS 0.86%
Description
The BPF subsystem in the Linux kernel before 4.5.5 mishandles reference counts, which allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via a crafted application on (1) a system with more than 32 Gb of memory, related to the program reference count or (2) a 1 Tb system, related to the map reference count.
Affected products
No data.
Configuration 1
- ≥ 4.4 · < 4.4.11
- ≥ 4.5 · < 4.5.5
Configuration 2
- 14.04
- 16.04
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
This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4, 5, 6, 7 and Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:C/I:C/A:C
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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.86% (0.00865) | 57.14th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.86% (0.00865) | 53.73th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.31% (0.00308) | 51.79th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00062) | 28.34th | v3 (v2023.03.01) |
| May 11, 2024 | 0.06% (0.00062) | 25.78th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00061) | 23.77th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.25% (0.02249) | 81.27th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.25% (0.02249) | 79.46th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.25% (0.02249) | 58.11th | v2 (v2022.01.01) |
References (11)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92117d8443bc5afacc8d5ba82e541946310f106e x_refsource_CONFIRMVendor Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5 x_refsource_CONFIRMVendor Advisory
- http://www.openwall.com/lists/oss-security/2016/05/06/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.ubuntu.com/usn/USN-3005-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-3006-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-3007-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-4558 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1334303 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/92117d8443bc5afacc8d5ba82e541946310f106e x_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-4558
- https://www.cve.org/CVERecord?id=CVE-2016-4558
Change history (0)
No recorded changes yet.