kernel: Use after free vulnerability via double fdput
Published May 23, 2016
7.8
HIGHCVSS 3.1
EPSS 10.20%
Description
The replace_map_fd_with_map_ptr function in kernel/bpf/verifier.c in the Linux kernel before 4.5.5 does not properly maintain an fd data structure, which allows local users to gain privileges or cause a denial of service (use-after-free) via crafted BPF instructions that reference an incorrect file descriptor.
Affected products
No data.
- ≥ 4.4 · < 4.4.11
- ≥ 4.5 · < 4.5.5
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 5, 6, 7 and Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:L/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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 10.20% (0.10202) | 95.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 10.20% (0.10202) | 95.06th | v5 (v2026.06.15) |
| Jan 22, 2026 | 19.46% (0.19461) | 95.20th | v4 (v2025.03.14) |
| Jan 19, 2026 | 17.55% (0.17555) | 94.87th | v4 (v2025.03.14) |
| Sep 1, 2025 | 15.04% (0.15042) | 94.35th | v4 (v2025.03.14) |
| Jul 8, 2025 | 16.12% (0.16120) | 94.49th | v4 (v2025.03.14) |
| Apr 29, 2025 | 13.34% (0.13342) | 93.75th | v4 (v2025.03.14) |
| Mar 30, 2025 | 15.13% (0.15131) | 94.02th | v4 (v2025.03.14) |
| Mar 29, 2025 | 18.90% (0.18900) | 92.29th | v4 (v2025.03.14) |
| Mar 17, 2025 | 15.13% (0.15131) | 94.08th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00088) | 39.42th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.09% (0.00089) | 36.57th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.21% (0.02212) | 81.20th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.21% (0.02212) | 79.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.21% (0.02212) | 58.06th | v2 (v2022.01.01) |
References (12)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 x_refsource_CONFIRMVendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html vendor-advisoryx_refsource_SUSEMailing ListThird Party 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
- https://access.redhat.com/security/cve/CVE-2016-4557 Vendor Advisory
- https://bugs.chromium.org/p/project-zero/issues/detail?id=808 x_refsource_MISCThird Party Advisory
- https://bugs.debian.org/823603 x_refsource_CONFIRMThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1334307 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 x_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-4557
- https://www.cve.org/CVERecord?id=CVE-2016-4557
- https://www.exploit-db.com/exploits/40759/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
Change history (0)
No recorded changes yet.