kernel: Missing access_ok() checks in waitid()
Published Nov 2, 2021
8.8
HIGHCVSS 3.1
EPSS 3.71%
Description
Insufficient data validation in waitid allowed an user to escape sandboxes on Linux.
Affected products
No data.
Configuration 1
- ≥ 4.13 · < 4.13.7
Configuration 2
- n/a
Configuration 3
- n/a
Configuration 4
- n/a
Configuration 5
- n/a
Configuration 6
- n/a
Configuration 7
- n/a
Configuration 8
- n/a
Configuration 9
- n/a
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-alt
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-alt | 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 did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux as they did not include the upstream commit https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4c48abe91be03d191d0c20cc755877da2cb35622 that introduced this issue.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:L/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
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.71% (0.03714) | 89.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.71% (0.03714) | 88.31th | v5 (v2026.06.15) |
| Nov 21, 2025 | 1.98% (0.01984) | 83.03th | v4 (v2025.03.14) |
| Nov 18, 2025 | 0.78% (0.00776) | 71.50th | v4 (v2025.03.14) |
| Oct 6, 2025 | 1.98% (0.01984) | 82.93th | v4 (v2025.03.14) |
| Aug 4, 2025 | 3.65% (0.03649) | 87.44th | v4 (v2025.03.14) |
| Apr 30, 2025 | 1.98% (0.01984) | 82.56th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.08% (0.03082) | 85.57th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.83% (0.06827) | 85.20th | v4 (v2025.03.14) |
| Mar 28, 2025 | 3.08% (0.03084) | 85.59th | v4 (v2025.03.14) |
| Mar 27, 2025 | 6.83% (0.06830) | 90.03th | v4 (v2025.03.14) |
| Mar 20, 2025 | 3.08% (0.03084) | 85.67th | v4 (v2025.03.14) |
| Mar 19, 2025 | 6.83% (0.06830) | 90.18th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.08% (0.03084) | 85.87th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00064) | 29.99th | v3 (v2023.03.01) |
| Oct 20, 2023 | 0.06% (0.00064) | 26.62th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00062) | 24.60th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.24% (0.02243) | 81.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.24% (0.02243) | 58.11th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.63% (0.03630) | 71.73th | v5 (v2026.06.15) |
| Nov 3, 2021 | 2.74% (0.02742) | 80.68th | v1 |
References (7)
- https://access.redhat.com/security/cve/CVE-2017-5123 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1500094 Issue Tracking
- https://crbug.com/772848 x_refsource_MISCVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96ca579a1ecc943b75beba58bebb0356f6cc4b51 x_refsource_MISCPatchVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-5123
- https://security.netapp.com/advisory/ntap-20211223-0003/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-5123
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2017-5123 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1500094 | Issue Tracking | |
| https://crbug.com/772848 | x_refsource_MISCVendor Advisory | |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96ca579a1ecc943b75beba58bebb0356f6cc4b51 | x_refsource_MISCPatchVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-5123 | ||
| https://security.netapp.com/advisory/ntap-20211223-0003/ | x_refsource_CONFIRMThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2017-5123 |
Change history (0)
No recorded changes yet.